History of medieval Christianity
Encyclopedia
The history of medieval Christianity traces Christianity
Christianity
Christianity is a monotheistic religion based on the life and teachings of Jesus as presented in canonical gospels and other New Testament writings...

 during the Middle Ages
Middle Ages
The Middle Ages is a periodization of European history from the 5th century to the 15th century. The Middle Ages follows the fall of the Western Roman Empire in 476 and precedes the Early Modern Era. It is the middle period of a three-period division of Western history: Classic, Medieval and Modern...

 - the period after the Fall of Rome (c.476) until the Protestant Reformation
Protestant Reformation
The Protestant Reformation was a 16th-century split within Western Christianity initiated by Martin Luther, John Calvin and other early Protestants. The efforts of the self-described "reformers", who objected to the doctrines, rituals and ecclesiastical structure of the Roman Catholic Church, led...

 (c.1517), considered the start of the modern era.

Included in this period is the Age of Discovery
Age of Discovery
The Age of Discovery, also known as the Age of Exploration and the Great Navigations , was a period in history starting in the early 15th century and continuing into the early 17th century during which Europeans engaged in intensive exploration of the world, establishing direct contacts with...

, during which Christianity became the world's largest religion
Major religious groups
The world's principal religions and spiritual traditions may be classified into a small number of major groups, although this is by no means a uniform practice...

.

Among the dioceses, five
Pentarchy
Pentarchy is a term in the history of Christianity for the idea of universal rule over all Christendom by the heads of five major episcopal sees, or patriarchates, of the Roman Empire: Rome, Constantinople, Alexandria, Antioch, and Jerusalem...

 held special eminence: Rome
Pope
The Pope is the Bishop of Rome, a position that makes him the leader of the worldwide Catholic Church . In the Catholic Church, the Pope is regarded as the successor of Saint Peter, the Apostle...

, Constantinople
Patriarch of Constantinople
The Ecumenical Patriarch is the Archbishop of Constantinople – New Rome – ranking as primus inter pares in the Eastern Orthodox communion, which is seen by followers as the One, Holy, Catholic, and Apostolic Church....

, Jerusalem
Greek Orthodox Patriarch of Jerusalem
The Greek Orthodox Patriarch of Jerusalem is the head bishop of the Orthodox Church of Jerusalem, ranking fourth of nine Patriarchs in the Eastern Orthodox Church. Since 2005, the Orthodox Patriarch of Jerusalem has been Theophilos III...

, Antioch
Patriarch of Antioch
Patriarch of Antioch is a traditional title held by the Bishop of Antioch. As the traditional "overseer" of the first gentile Christian community, the position has been of prime importance in the church from its earliest period...

, and Alexandria
Patriarch of Alexandria
The Patriarch of Alexandria is the Archbishop of Alexandria and Cairo, Egypt. Historically, this office has included the designation of Pope , and did so earlier than that of the Bishop of Rome...

, generally referred to as the Pentarchy
Pentarchy
Pentarchy is a term in the history of Christianity for the idea of universal rule over all Christendom by the heads of five major episcopal sees, or patriarchates, of the Roman Empire: Rome, Constantinople, Alexandria, Antioch, and Jerusalem...

. The prestige of most of these sees depended in part on their apostolic
Apostle (Christian)
The term apostle is derived from Classical Greek ἀπόστολος , meaning one who is sent away, from στέλλω + από . The literal meaning in English is therefore an "emissary", from the Latin mitto + ex...

 founders, or in the case of Byzantium/Constantinople, that it was the new seat (New Rome) of the continuing Roman or Byzantine Empire
Byzantine Empire
The Byzantine Empire was the Eastern Roman Empire during the periods of Late Antiquity and the Middle Ages, centred on the capital of Constantinople. Known simply as the Roman Empire or Romania to its inhabitants and neighbours, the Empire was the direct continuation of the Ancient Roman State...

. These bishops considered themselves the spiritual successors of those apostles
Apostolic Succession
Apostolic succession is a doctrine, held by some Christian denominations, which asserts that the chosen successors of the Twelve Apostles, from the first century to the present day, have inherited the spiritual, ecclesiastical and sacramental authority, power, and responsibility that were...

. In addition, all five cities were Early centers of Christianity
Early centers of Christianity
Early Christianity spread from Western Asia, throughout the Roman Empire, and beyond into East Africa and South Asia, reaching as far as India. At first, this development was closely connected to centers of Hebrew faith, in the Holy Land and the Jewish diaspora...

.

Early Middle Ages (476–799)


The Early Middle Ages commenced with the deposition of the last Western Roman emperor in 476, to be followed by the barbarian king, Odoacer
Odoacer
Flavius Odoacer , also known as Flavius Odovacer, was the first King of Italy. His reign is commonly seen as marking the end of the Western Roman Empire. Though the real power in Italy was in his hands, he represented himself as the client of Julius Nepos and, after Nepos' death in 480, of the...

, to the coronation of Charlemagne as "Emperor of the Romans" by Pope Leo III in Rome on Christmas Day, 800. The year 476, however, is a rather artificial division. In the East, Roman imperial rule continued through the period historians now call the Byzantine Empire
Byzantine Empire
The Byzantine Empire was the Eastern Roman Empire during the periods of Late Antiquity and the Middle Ages, centred on the capital of Constantinople. Known simply as the Roman Empire or Romania to its inhabitants and neighbours, the Empire was the direct continuation of the Ancient Roman State...

. Even in the West, where imperial political control gradually declined, distinctly Roman culture continued long afterwards; thus historians today prefer to speak of a "transformation of the Roman world" rather than a "fall of the Roman Empire." The advent of the Early Middle Ages was a gradual and often localised process whereby, in the West, rural areas became power centres whilst urban areas declined. With the Muslim invasions of the seventh century, the Western (Latin) and Eastern (Greek) areas of Christianity began to take on distinctive shapes. Whereas in the East the Church maintained its structure and character and evolved more slowly, in the West the Bishops of Rome (i.e., the Popes) were forced to adapt more quickly and flexibly to drastically changing circumstances. In particular whereas the bishops of the East maintained clear allegiance to the Eastern Roman Emperor, the Bishop of Rome, while maintaining nominal allegiance to the Eastern Emperor, was forced to negotiate delicate balances with the "barbarian rulers" of the former Western provinces. Although the greater number of Christians remained in the East, the developments in the West would set the stage for major developments in the Christian world during the later Middle Ages.

Early Medieval Papacy

After the Italian peninsula fell into warfare and turmoil due to the barbarian tribes, the Emperor Justinian I
Justinian I
Justinian I ; , ; 483– 13 or 14 November 565), commonly known as Justinian the Great, was Byzantine Emperor from 527 to 565. During his reign, Justinian sought to revive the Empire's greatness and reconquer the lost western half of the classical Roman Empire.One of the most important figures of...

 attempted to reassert imperial dominion in Italy from the East, against the Gothic aristocracy. The subsequent campaigns were more or less successful, and an Imperial Exarch
Exarch
In the Byzantine Empire, an exarch was governor with extended authority of a province at some remove from the capital Constantinople. The prevailing situation frequently involved him in military operations....

ate was established for Italy, but imperial influence was limited. The Lombards
Lombards
The Lombards , also referred to as Longobards, were a Germanic tribe of Scandinavian origin, who from 568 to 774 ruled a Kingdom in Italy...

 then invaded the weakened peninsula, and Rome was essentially left to fend for itself. The failure of the East to send aid resulted in the popes themselves feeding the city with grain from papal estates, negotiating treaties, paying protection money to Lombard warlords, and, failing that, hiring soldiers to defend the city. Eventually the popes turned to others for support, especially the Franks.

Spread beyond the Roman Empire

As the political boundaries of the Roman Empire
Roman Empire
The Roman Empire was the post-Republican period of the ancient Roman civilization, characterised by an autocratic form of government and large territorial holdings in Europe and around the Mediterranean....

 diminished and then collapsed in the West, Christianity spread beyond the old borders of the Empire and into lands that had never been under Rome.

Irish and Irish missionaries

Beginning in the fifth century, a unique culture developed around the Irish Sea consisting of what today would be called Wales and Ireland. In this environment, Christianity spread from Roman Britain
Roman Britain
Roman Britain was the part of the island of Great Britain controlled by the Roman Empire from AD 43 until ca. AD 410.The Romans referred to the imperial province as Britannia, which eventually comprised all of the island of Great Britain south of the fluid frontier with Caledonia...

 to Ireland, especially aided by the missionary activity of St. Patrick
Saint Patrick
Saint Patrick was a Romano-Briton and Christian missionary, who is the most generally recognized patron saint of Ireland or the Apostle of Ireland, although Brigid of Kildare and Colmcille are also formally patron saints....

. Patrick had been captured into slavery in Ireland and, following his escape and later consecration as bishop, he returned to the isle that had enslaved him so that he could bring them the Gospel. Soon, Irish missionaries such as SS. Columba
Columba
Saint Columba —also known as Colum Cille , Colm Cille , Calum Cille and Kolban or Kolbjørn —was a Gaelic Irish missionary monk who propagated Christianity among the Picts during the Early Medieval Period...

 and Columbanus
Columbanus
Columbanus was an Irish missionary notable for founding a number of monasteries on the European continent from around 590 in the Frankish and Lombard kingdoms, most notably Luxeuil and Bobbio , and stands as an exemplar of Irish missionary activity in early medieval Europe.He spread among the...

 spread this Christianity, with its distinctively Irish features, to Scotland and the Continent. One such feature was the system of private penitence, which replaced the former practice of penance as a public rite.

Anglo-Saxons, English

Although southern Britain had been a Roman province, in 407 the imperial legions left the isle, and the Roman elite followed. Some time later that century, various barbarian tribes went from raiding and pillaging the island to settling and invading. These tribes are referred to as the "Anglo-Saxons", predecessors of the English. They were entirely pagan, having never been part of the Empire, and although they experienced Christian influence from the surrounding peoples, they were converted by the mission of St. Augustine
Augustine of Canterbury
Augustine of Canterbury was a Benedictine monk who became the first Archbishop of Canterbury in the year 597...

 sent by Pope Gregory the Great
Pope Gregory I
Pope Gregory I , better known in English as Gregory the Great, was pope from 3 September 590 until his death...

. Later, under Archbishop Theodore
Theodore of Tarsus
Theodore was the eighth Archbishop of Canterbury, best known for his reform of the English Church and establishment of a school in Canterbury....

, the Anglo-Saxons enjoyed a golden age of culture and scholarship. Soon, important English missionaries such as SS. Wilfrid
Wilfrid
Wilfrid was an English bishop and saint. Born a Northumbrian noble, he entered religious life as a teenager and studied at Lindisfarne, at Canterbury, in Gaul, and at Rome; he returned to Northumbria in about 660, and became the abbot of a newly founded monastery at Ripon...

, Willibrord
Willibrord
__notoc__Willibrord was a Northumbrian missionary saint, known as the "Apostle to the Frisians" in the modern Netherlands...

, Lullus
Lullus
Saint Lullus was the first permanent archbishop of Mainz, succeeding Saint Boniface, and first abbot of the Benedictine Hersfeld Abbey.-Monk to archbishop:...

 and Boniface would begin evangelising their Saxon relatives in Germany.

Franks

The largely Christian Gallo-Roman inhabitants of Gaul
Gaul
Gaul was a region of Western Europe during the Iron Age and Roman era, encompassing present day France, Luxembourg and Belgium, most of Switzerland, the western part of Northern Italy, as well as the parts of the Netherlands and Germany on the left bank of the Rhine. The Gauls were the speakers of...

 (modern France) were overrun by Germanic Franks
Franks
The Franks were a confederation of Germanic tribes first attested in the third century AD as living north and east of the Lower Rhine River. From the third to fifth centuries some Franks raided Roman territory while other Franks joined the Roman troops in Gaul. Only the Salian Franks formed a...

 in the early 5th century. The native inhabitants were persecuted until the Frankish King, Clovis I
Clovis I
Clovis Leuthwig was the first King of the Franks to unite all the Frankish tribes under one ruler, changing the leadership from a group of royal chieftains, to rule by kings, ensuring that the kingship was held by his heirs. He was also the first Catholic King to rule over Gaul . He was the son...

 converted from paganism to Roman Catholicism in 496. Clovis insisted that his fellow nobles follow suit, strengthening his newly-established kingdom by uniting the faith of the rulers with that of the ruled.

Frisians of the Low Countries

In 698 the Northumbria
Northumbria
Northumbria was a medieval kingdom of the Angles, in what is now Northern England and South-East Scotland, becoming subsequently an earldom in a united Anglo-Saxon kingdom of England. The name reflects the approximate southern limit to the kingdom's territory, the Humber Estuary.Northumbria was...

n Benedictine monk, Willibrord
Willibrord
__notoc__Willibrord was a Northumbrian missionary saint, known as the "Apostle to the Frisians" in the modern Netherlands...

 was commissioned by Pope Sergius I
Pope Sergius I
Pope Saint Sergius I was pope from 687 to 701. Selected to end a schism between Antipope Paschal and Antipope Theodore, Sergius I ended the last disputed sede vacante of the Byzantine Papacy....

 as bishop of the Frisians in what is now the Netherlands
Netherlands
The Netherlands is a constituent country of the Kingdom of the Netherlands, located mainly in North-West Europe and with several islands in the Caribbean. Mainland Netherlands borders the North Sea to the north and west, Belgium to the south, and Germany to the east, and shares maritime borders...

. Willibrord established a church in Utrecht
Utrecht (city)
Utrecht city and municipality is the capital and most populous city of the Dutch province of Utrecht. It is located in the eastern corner of the Randstad conurbation, and is the fourth largest city of the Netherlands with a population of 312,634 on 1 Jan 2011.Utrecht's ancient city centre features...

.

Much of Willibrord's work was wiped out when the pagan Radbod, king of the Frisians
Radbod, King of the Frisians
Radbod was the king of Frisia from c. 680 until his death. He is often considered the last independent ruler of Frisia before Frankish domination. He defeated Charles Martel at Cologne. Eventually, however, Charles prevailed and compelled the Frisians to submit...

 destroyed many Christian centres between 716 and 719. In 717, the English missionary Boniface was sent to aid Willibrord, re-establishing churches in Frisia and continuing to preach throughout the pagan lands of Germany. Boniface was killed by pagans in 754.

Iconoclasm


Iconoclasm
Iconoclasm (Byzantine)
The Byzantine Iconoclasm encompasses two periods in the history of the Byzantine Empire when Emperors, backed by imperially-appointed leaders and councils of the Orthodox Church imposed a ban on religious images or icons. The "First Iconoclasm", as it is sometimes called, lasted between about 730...

 as a movement began within the Eastern Christian Byzantine church in the early 8th century, following a series of heavy military reverses against the Muslims
Islam
Islam . The most common are and .   : Arabic pronunciation varies regionally. The first vowel ranges from ~~. The second vowel ranges from ~~~...

. Sometime between 726–730 the Byzantine Emperor Leo III the Isaurian
Leo III the Isaurian
Leo III the Isaurian or the Syrian , was Byzantine emperor from 717 until his death in 741...

 ordered the removal of an image of Jesus prominently placed over the Chalke
Chalke
The Chalke Gate , was the main ceremonial entrance to the Great Palace of Constantinople in the Byzantine period. The name, which means "the Bronze Gate", was given to it either because of the bronze portals or from the gilded bronze tiles used in its roof. The interior was lavishly decorated with...

 gate, the ceremonial entrance to the Great Palace of Constantinople
Great Palace of Constantinople
The Great Palace of Constantinople — also known as the Sacred Palace — was the large Imperial Byzantine palace complex located in the south-eastern end of the peninsula now known as "Old Istanbul", modern Turkey...

, and its replacement with a cross. This was followed by orders banning the pictorial representation of the family of Christ, subsequent Christian saints, and biblical scenes. In the West, Pope Gregory III
Pope Gregory III
Pope Saint Gregory III was pope from 731 to 741. A Syrian by birth, he succeeded Gregory II in March 731. His pontificate, like that of his predecessor, was disturbed by the iconoclastic controversy in the Byzantine Empire, in which he vainly invoked the intervention of Charles Martel.Elected by...

 held two synods at Rome and condemned Leo's actions. In Leo's realms, the Iconoclast Council at Hieria, 754 ruled that the culture of holy portraits (see icon
Icon
An icon is a religious work of art, most commonly a painting, from Eastern Christianity and in certain Eastern Catholic churches...

) was not of a Christian origin and therefore heretical. The movement destroyed much of the Christian church's early artistic history, to the great loss of subsequent art and religious historians. The iconoclastic movement itself was later defined as heretical in 787 under the Seventh Ecumenical council
Second Council of Nicaea
The Second Council of Nicaea is regarded as the Seventh Ecumenical Council by Roman Catholics, Eastern Orthodox, Eastern Catholic Churches and various other Western Christian groups...

, but enjoyed a brief resurgence between 815 and 842.

High Middle Ages (800–1300)

Carolingian Renaissance

The Carolingian Renaissance
Carolingian Renaissance
In the history of ideas the Carolingian Renaissance stands out as a period of intellectual and cultural revival in Europe occurring from the late eighth century, in the generation of Alcuin, to the 9th century, and the generation of Heiric of Auxerre, with the peak of the activities coordinated...

 was a period of intellectual and cultural revival during the late 8th and 9th centuries, mostly during the reigns of Charlemagne
Charlemagne
Charlemagne was King of the Franks from 768 and Emperor of the Romans from 800 to his death in 814. He expanded the Frankish kingdom into an empire that incorporated much of Western and Central Europe. During his reign, he conquered Italy and was crowned by Pope Leo III on 25 December 800...

 and Louis the Pious
Louis the Pious
Louis the Pious , also called the Fair, and the Debonaire, was the King of Aquitaine from 781. He was also King of the Franks and co-Emperor with his father, Charlemagne, from 813...

. There was an increase of literature
Literature
Literature is the art of written works, and is not bound to published sources...

, the art
Art
Art is the product or process of deliberately arranging items in a way that influences and affects one or more of the senses, emotions, and intellect....

s, architecture
Architecture
Architecture is both the process and product of planning, designing and construction. Architectural works, in the material form of buildings, are often perceived as cultural and political symbols and as works of art...

, jurisprudence
Jurisprudence
Jurisprudence is the theory and philosophy of law. Scholars of jurisprudence, or legal theorists , hope to obtain a deeper understanding of the nature of law, of legal reasoning, legal systems and of legal institutions...

, liturgical and scriptural
Religious text
Religious texts, also known as scripture, scriptures, holy writ, or holy books, are the texts which various religious traditions consider to be sacred, or of central importance to their religious tradition...

 studies. The period also saw the development of Carolingian minuscule
Carolingian minuscule
Carolingian or Caroline minuscule is a script developed as a writing standard in Europe so that the Roman alphabet could be easily recognized by the literate class from one region to another. It was used in Charlemagne's empire between approximately 800 and 1200...

, the ancestor of modern lower-case script, and the standardisation of Latin which had hitherto become varied and irregular (see Medieval Latin
Medieval Latin
Medieval Latin was the form of Latin used in the Middle Ages, primarily as a medium of scholarly exchange and as the liturgical language of the medieval Roman Catholic Church, but also as a language of science, literature, law, and administration. Despite the clerical origin of many of its authors,...

). To address the problems of illiteracy among clergy and court scribes, Charlemagne founded schools and attracted the most learned men from all of Europe to his court, such as Theodulf, Paul the Deacon
Paul the Deacon
Paul the Deacon , also known as Paulus Diaconus, Warnefred, Barnefridus and Cassinensis, , was a Benedictine monk and historian of the Lombards.-Life:...

, Angilbert
Angilbert
Saint Angilbert was a Frank who served Charlemagne as a diplomat, abbot, poet and semi-son-in-law. He was of noble Frankish parentage, and educated at the palace school in Aquae Grani under Alcuin...

, Paulinus of Aquileia, and Alcuin of York.

Growing tensions between East and West

The cracks and fissures in Christian unity which led to the East-West Schism
East-West Schism
The East–West Schism of 1054, sometimes known as the Great Schism, formally divided the State church of the Roman Empire into Eastern and Western branches, which later became known as the Eastern Orthodox Church and the Roman Catholic Church, respectively...

 started to become evident as early as the fourth century
Christianity in the 4th century
Christianity in the 4th century was dominated by Constantine the Great, and the First Council of Nicea of 325, which was the beginning of the period of the First seven Ecumenical Councils and the attempt to reach an orthodox consensus and to establish a unified Christendom as the State church of...

. Cultural, political, and linguistic differences were often mixed with the theological, leading to schism.

The transfer of the Roman capital to Constantinople inevitably brought mistrust, rivalry, and even jealousy to the relations of the two great sees, Rome and Constantinople. It was easy for Rome to be jealous of Constantinople at a time when it was rapidly losing its political prominence. Estrangement was also helped along by the German invasions in the West, which effectively weakened contacts. The rise of Islam with its conquest of most of the Mediterranean coastline (not to mention the arrival of the pagan Slavs in the Balkans at the same time) further intensified this separation by driving a physical wedge between the two worlds. The once homogenous unified world of the Mediterranean was fast vanishing. Communication between the Greek East and Latin West by the 600s had become dangerous and practically ceased.

Two basic problems — the nature of the primacy of the bishop of Rome
Primacy of the Roman Pontiff
The primacy of the Bishop of Rome is an ecclesiastical doctrine held by some branches of Christianity, most notably the Catholic Church, the Eastern Orthodox Church and the Anglican Communion. The doctrine concerns the respect and authority that is due to the Bishop of Rome from bishops and their...

 and the theological implications of adding a clause to the Nicene Creed
Nicene Creed
The Nicene Creed is the creed or profession of faith that is most widely used in Christian liturgy. It is called Nicene because, in its original form, it was adopted in the city of Nicaea by the first ecumenical council, which met there in the year 325.The Nicene Creed has been normative to the...

, known as the filioque clause
Filioque clause
Filioque , Latin for "and the Son", is a phrase found in the form of Nicene Creed in use in the Latin Church. It is not present in the Greek text of the Nicene Creed as originally formulated at the First Council of Constantinople, which says only that the Holy Spirit proceeds "from the Father":The...

 — were involved. These doctrinal issues were first openly discussed in Photius's patriarchate.

By the fifth century, Christendom was divided into a pentarchy of five sees with Rome accorded a primacy. The four Eastern sees of the pentarchy, considered this determined by canonical decision and did not entail hegemony of any one local church or patriarchate over the others. However, Rome began to interpret her primacy in terms of sovereignty, as a God-given right involving universal jurisdiction in the Church. The collegial and conciliar nature of the Church, in effect, was gradually abandoned in favour of supremacy of unlimited papal power over the entire Church. These ideas were finally given systematic expression in the West during the Gregorian Reform
Gregorian Reform
The Gregorian Reforms were a series of reforms initiated by Pope Gregory VII and the circle he formed in the papal curia, circa 1050–80, which dealt with the moral integrity and independence of the clergy...

 movement of the eleventh century. The Eastern churches viewed Rome's understanding of the nature of episcopal power as being in direct opposition to the Church's essentially conciliar structure and thus saw the two ecclesiologies as mutually antithetical. For them, specifically, Simon Peter's primacy
Primacy of Simon Peter
Most Christians hold that Simon Peter was the most prominent of the Apostles, called the Prince of the Apostles and favored by Jesus of Nazareth. As such, it is argued that Peter held the first place of honor and authority...

 could never be the exclusive prerogative of any one bishop. All bishops must, like St. Peter, confess Jesus as the Christ and, as such, all are Peter's successors. The churches of the East gave the Roman See, primacy but not supremacy. The Pope being the first among equals, but not infallible and not with absolute authority.

The other major irritant to Eastern Christendom was the Western use of the filioque clause—meaning "and the Son"—in the Nicene Creed . This too developed gradually and entered the Creed over time. The issue was the addition by the West of the Latin clause filioque to the Creed, as in "the Holy Spirit... who proceeds from the Father and the Son," where the original Creed, sanctioned by the councils and still used today, by the Eastern Orthodox simply states "the Holy Spirit, the Lord and Giver of Life, who proceeds from the Father." The Eastern Church argued that the phrase had been added unilaterally and, therefore, illegitimately, since the East had never been consulted. In the final analysis, only another ecumenical council could introduce such an alteration. Indeed the councils, which drew up the original Creed, had expressly forbidden any subtraction or addition to the text. In addition to this ecclesiological issue, the Eastern Church also considered the filioque clause unacceptable on dogmatic grounds. Theologically, the Latin interpolation was unacceptable since it implied that the Spirit now had two sources of origin and procession, the Father and the Son, rather than the Father alone.

Photian schism

In the 9th century AD, a controversy arose between Eastern (Byzantine, later Orthodox) and Western (Latin, Roman Catholic) Christianity that was precipitated by the opposition of the Roman Pope John VII
Pope John VII
Pope John VII was pope from 705 to 707. The successor of John VI, he was of Greek ancestry. He is one of the popes of the Byzantine captivity.-Biography:...

 to the appointment by the Byzantine emperor Michael III of Photius I
Patriarch Photios I of Constantinople
Photios I , also spelled Photius or Fotios, was the Ecumenical Patriarch of Constantinople from 858 to 867 and from 877 to 886. He is recognized in the Eastern Orthodox churches as St...

 to the position of patriarch of Constantinople. Photios was refused an apology by the pope for previous points of dispute between the East and West. Photius refused to accept the supremacy of the pope in Eastern matters or accept the filioque clause. The Latin delegation at the council of his consecration pressed him to accept the clause in order to secure their support.

The controversy also involved Eastern and Western ecclesiastical jurisdictional rights in the Bulgarian church, as well as a doctrinal dispute over the Filioque ("and from the Son") clause. That had been added to the Nicene Creed
Nicene Creed
The Nicene Creed is the creed or profession of faith that is most widely used in Christian liturgy. It is called Nicene because, in its original form, it was adopted in the city of Nicaea by the first ecumenical council, which met there in the year 325.The Nicene Creed has been normative to the...

 by the Latin church, which was later the theological breaking point in the ultimate Great East-West Schism
East-West Schism
The East–West Schism of 1054, sometimes known as the Great Schism, formally divided the State church of the Roman Empire into Eastern and Western branches, which later became known as the Eastern Orthodox Church and the Roman Catholic Church, respectively...

 in the eleventh century.

Photius did provide concession on the issue of jurisdictional rights concerning Bulgaria and the papal legates made do with his return of Bulgaria to Rome. This concession, however, was purely nominal, as Bulgaria's return to the Byzantine rite in 870 had already secured for it an autocephalous church. Without the consent of Boris I of Bulgaria
Boris I of Bulgaria
Boris I, also known as Boris-Mihail and Bogoris was the Knyaz of First Bulgarian Empire in 852–889. At the time of his baptism in 864, Boris was named Michael after his godfather, Emperor Michael III...

, the papacy was unable to enforce any of its claims.

East-West Schism

The East-West Schism
East-West Schism
The East–West Schism of 1054, sometimes known as the Great Schism, formally divided the State church of the Roman Empire into Eastern and Western branches, which later became known as the Eastern Orthodox Church and the Roman Catholic Church, respectively...

, or Great Schism, separated the Church into Western (Latin) and Eastern (Greek) branches, i.e., Western Catholicism and Eastern Orthodoxy. It was the first major division since certain groups in the East rejected the decrees of the Council of Chalcedon
Council of Chalcedon
The Council of Chalcedon was a church council held from 8 October to 1 November, 451 AD, at Chalcedon , on the Asian side of the Bosporus. The council marked a significant turning point in the Christological debates that led to the separation of the church of the Eastern Roman Empire in the 5th...

 (see Oriental Orthodoxy
Oriental Orthodoxy
Oriental Orthodoxy is the faith of those Eastern Christian Churches that recognize only three ecumenical councils — the First Council of Nicaea, the First Council of Constantinople and the First Council of Ephesus. They rejected the dogmatic definitions of the Council of Chalcedon...

), and was far more significant. Though normally dated to 1054, the East-West Schism was actually the result of an extended period of estrangement between Latin and Greek Christendom over the nature of papal primacy and certain doctrinal matters like the filioque
Filioque clause
Filioque , Latin for "and the Son", is a phrase found in the form of Nicene Creed in use in the Latin Church. It is not present in the Greek text of the Nicene Creed as originally formulated at the First Council of Constantinople, which says only that the Holy Spirit proceeds "from the Father":The...

, but intensified by cultural and linguistic differences.

The "official" schism in 1054 was the excommunication of Patriarch Michael Cerularius of Constantinople, followed by his excommunication of papal legates. Attempts at reconciliation were made in 1274 (by the Second Council of Lyon
Second Council of Lyon
The Second Council of Lyon was the fourteenth ecumenical council of the Catholic Church, convoked on 31 March 1272 and convened in Lyon, France, in 1274. Pope Gregory X presided over the council, called to act on a pledge by Byzantine emperor Michael VIII to reunite the Eastern church with the West...

) and in 1439 (by the Council of Basel), but in each case the eastern hierarchs who consented to the unions were repudiated by the Orthodox as a whole, though reconciliation was achieved between the West and what are now called the "Eastern Rite Catholic Churches
Eastern Rite Catholic Churches
The Eastern Catholic Churches are autonomous, self-governing particular churches in full communion with the Bishop of Rome, the Pope. Together with the Latin Church, they compose the worldwide Catholic Church...

." More recently, in 1965 the mutual excommunications were rescinded
Catholic-Orthodox joint declaration of 1965
The Catholic-Orthodox Joint Declaration of 1965 was read out on 7 December 1965 simultaneously at a public meeting of the Second Vatican Council in Rome and at a special ceremony in Istanbul. It withdrew the exchange of excommunications between prominent ecclesiastics in the Roman see and the...

 by the Pope and the Patriarch of Constantinople, though schism remains.

Both groups are descended from the Early Church, both acknowledge the apostolic succession
Apostolic Succession
Apostolic succession is a doctrine, held by some Christian denominations, which asserts that the chosen successors of the Twelve Apostles, from the first century to the present day, have inherited the spiritual, ecclesiastical and sacramental authority, power, and responsibility that were...

 of each other's bishops, and the validity of each other's sacrament
Sacrament
A sacrament is a sacred rite recognized as of particular importance and significance. There are various views on the existence and meaning of such rites.-General definitions and terms:...

s. Though both acknowledge the primacy of the Bishop of Rome, Eastern Orthodoxy understands this as a primacy of honour with limited or no ecclesiastical authority in other dioceses.

The Orthodox East perceived the Papacy as taking on monarchical characteristics that were not in line with the church's tradition.

The final breach is often considered to have arisen after the capture and sacking of Constantinople by the Fourth Crusade
Fourth Crusade
The Fourth Crusade was originally intended to conquer Muslim-controlled Jerusalem by means of an invasion through Egypt. Instead, in April 1204, the Crusaders of Western Europe invaded and conquered the Christian city of Constantinople, capital of the Eastern Roman Empire...

 in 1204. Crusades against Christians in the East by Roman Catholic crusaders was not exclusive to the Mediterranean though (see also the Northern Crusades
Northern Crusades
The Northern Crusades or Baltic Crusades were crusades undertaken by the Christian kings of Denmark and Sweden, the German Livonian and Teutonic military orders, and their allies against the pagan peoples of Northern Europe around the southern and eastern shores of the Baltic Sea...

 and the Battle of the Ice
Battle of the Ice
The Battle of the Ice , also known as the Battle of Lake Peipus , was a battle between the Republic of Novgorod and the Livonian branch of the Teutonic Knights on April 5, 1242, at Lake Peipus...

). The sacking of Constantinople
Constantinople
Constantinople was the capital of the Roman, Eastern Roman, Byzantine, Latin, and Ottoman Empires. Throughout most of the Middle Ages, Constantinople was Europe's largest and wealthiest city.-Names:...

 and the Church of Holy Wisdom
Hagia Sophia
Hagia Sophia is a former Orthodox patriarchal basilica, later a mosque, and now a museum in Istanbul, Turkey...

 and establishment of the Latin Empire
Latin Empire
The Latin Empire or Latin Empire of Constantinople is the name given by historians to the feudal Crusader state founded by the leaders of the Fourth Crusade on lands captured from the Byzantine Empire. It was established after the capture of Constantinople in 1204 and lasted until 1261...

 as a seeming attempt to supplant the Orthodox Byzantine Empire
Byzantine Empire
The Byzantine Empire was the Eastern Roman Empire during the periods of Late Antiquity and the Middle Ages, centred on the capital of Constantinople. Known simply as the Roman Empire or Romania to its inhabitants and neighbours, the Empire was the direct continuation of the Ancient Roman State...

 in 1204 is viewed with some rancour to the present day. Many in the East saw the actions of the West as a prime determining factor in the weakening of Byzantium. This led to the Empire's eventual conquest and fall to Islam. In 2004, Pope John Paul II
Pope John Paul II
Blessed Pope John Paul II , born Karol Józef Wojtyła , reigned as Pope of the Catholic Church and Sovereign of Vatican City from 16 October 1978 until his death on 2 April 2005, at of age. His was the second-longest documented pontificate, which lasted ; only Pope Pius IX ...

 extended a formal apology for the sacking of Constantinople in 1204; the apology was formally accepted by Patriarch Bartholomew of Constantinople. Many things that were stolen during this time: holy relic
Relic
In religion, a relic is a part of the body of a saint or a venerated person, or else another type of ancient religious object, carefully preserved for purposes of veneration or as a tangible memorial...

s, riches, and many other items, are still held in various Western European cities, particularly Venice
Venice
Venice is a city in northern Italy which is renowned for the beauty of its setting, its architecture and its artworks. It is the capital of the Veneto region...

.

Monastic Reform

Cluny

From the 6th century
Christianity in the 6th century
In 533 Roman Emperor Justinian in Constantinople launched a military campaign to reclaim the western provinces from the Arian Germans, starting with North Africa and proceeding to Italy. Though he was temporarily successful in recapturing much of the western Mediterranean he destroyed the urban...

 onward most of the monasteries in the West were of the Benedictine Order. Owing to the stricter adherence to a reformed Benedictine rule
Rule of St Benedict
The Rule of Saint Benedict is a book of precepts written by St. Benedict of Nursia for monks living communally under the authority of an abbot. Since about the 7th century it has also been adopted by communities of women...

, the abbey of Cluny
Cluny Abbey
Cluny Abbey is a Benedictine monastery in Cluny, Saône-et-Loire, France. It was built in the Romanesque style, with three churches built in succession from the 10th to the early 12th centuries....

 became the acknowledged leader of western monasticism from the later 10th century. Cluny created a large, federated order in which the administrators of subsidiary houses served as deputies of the abbot of Cluny and answered to him. The Cluniac spirit was a revitalising influence on the Norman church, at its height from the second half of the 10th centuries
Christianity in the 10th century
-Pre-scholastic Theology:With the division and decline of the Carolingian Empire, notable theological activity was preserved in some of the Cathedral schools that had begun to rise to prominence under it – for instance at Auxerre in the 9th century or Chartres in the 11th...

 through the early 12th
Christianity in the 12th century
-Monastic Reform Movement:The next wave of monastic reform came with the Cistercian Movement. The first Cistercian abbey was founded by Robert of Molesme in 1098, at Cîteaux Abbey. The keynote of Cistercian life was a return to a literal observance of the Rule of Saint Benedict...

.

Cîteaux

The next wave of monastic reform came with the Cistercian Movement. The first Cistercian abbey
Abbey
An abbey is a Catholic monastery or convent, under the authority of an Abbot or an Abbess, who serves as the spiritual father or mother of the community.The term can also refer to an establishment which has long ceased to function as an abbey,...

 was founded in 1098, at Cîteaux Abbey. The keynote of Cistercian life was a return to a literal observance of the Benedictine rule
Rule of St Benedict
The Rule of Saint Benedict is a book of precepts written by St. Benedict of Nursia for monks living communally under the authority of an abbot. Since about the 7th century it has also been adopted by communities of women...

, rejecting the developments of the Benedictines. The most striking feature in the reform was the return to manual labour, and especially to field-work. Inspired by Bernard of Clairvaux
Bernard of Clairvaux
Bernard of Clairvaux, O.Cist was a French abbot and the primary builder of the reforming Cistercian order.After the death of his mother, Bernard sought admission into the Cistercian order. Three years later, he was sent to found a new abbey at an isolated clearing in a glen known as the Val...

, the primary builder of the Cistercians, they became the main force of technological diffusion in medieval Europe. By the end of the 12th century
Christianity in the 12th century
-Monastic Reform Movement:The next wave of monastic reform came with the Cistercian Movement. The first Cistercian abbey was founded by Robert of Molesme in 1098, at Cîteaux Abbey. The keynote of Cistercian life was a return to a literal observance of the Rule of Saint Benedict...

 the Cistercian houses numbered 500, and at its height in the 15th century
Christianity in the 15th century
The fifteenth century is part of the High Middle Ages, the period from the coronation of Charlemagne in 800 to the close of the fifteenth century, which saw the fall of Constantinople , the end of the Hundred Years War , the discovery of the New World , and thereafter the Protestant Reformation...

 the order claimed to have close to 750 houses. Most of these were built in wilderness areas, and played a major part in bringing such isolated parts of Europe into economic cultivation.

Mendicant orders

A third level of monastic reform was provided by the establishment of the Mendicant orders. Commonly known as friars, mendicants are live under a monastic rule with traditional vows of poverty, chastity and obedience, but they emphasise preaching, missionary activity, and education, in a secluded monastery. Beginning in the 12th century
Christianity in the 12th century
-Monastic Reform Movement:The next wave of monastic reform came with the Cistercian Movement. The first Cistercian abbey was founded by Robert of Molesme in 1098, at Cîteaux Abbey. The keynote of Cistercian life was a return to a literal observance of the Rule of Saint Benedict...

, the Franciscan
Franciscan
Most Franciscans are members of Roman Catholic religious orders founded by Saint Francis of Assisi. Besides Roman Catholic communities, there are also Old Catholic, Anglican, Lutheran, ecumenical and Non-denominational Franciscan communities....

 order was instituted by the followers of Francis of Assisi
Francis of Assisi
Saint Francis of Assisi was an Italian Catholic friar and preacher. He founded the men's Franciscan Order, the women’s Order of St. Clare, and the lay Third Order of Saint Francis. St...

, and thereafter the Dominican order
Dominican Order
The Order of Preachers , after the 15th century more commonly known as the Dominican Order or Dominicans, is a Catholic religious order founded by Saint Dominic and approved by Pope Honorius III on 22 December 1216 in France...

 was begun by St. Dominic
Saint Dominic
Saint Dominic , also known as Dominic of Osma, often called Dominic de Guzmán and Domingo Félix de Guzmán was the founder of the Friars Preachers, popularly called the Dominicans or Order of Preachers , a Catholic religious order...

.

Investiture Controversy

The Investiture Controversy
Investiture Controversy
The Investiture Controversy or Investiture Contest was the most significant conflict between Church and state in medieval Europe. In the 11th and 12th centuries, a series of Popes challenged the authority of European monarchies over control of appointments, or investitures, of church officials such...

, or Lay investiture controversy, was the most significant conflict between secular and religious
Separation of church and state (medieval)
The relationship between the Church and the feudal states during the medieval period went through a number of developments, roughly from the end of the Roman Empire through to the beginning of the Reformation...

 powers in medieval Europe. It began as a dispute in the 11th century between the Holy Roman Emperor
Holy Roman Emperor
The Holy Roman Emperor is a term used by historians to denote a medieval ruler who, as German King, had also received the title of "Emperor of the Romans" from the Pope...

 Henry IV
Henry IV, Holy Roman Emperor
Henry IV was King of the Romans from 1056 and Holy Roman Emperor from 1084 until his forced abdication in 1105. He was the third emperor of the Salian dynasty and one of the most powerful and important figures of the 11th century...

, and Pope Gregory VII
Pope Gregory VII
Pope St. Gregory VII , born Hildebrand of Sovana , was Pope from April 22, 1073, until his death. One of the great reforming popes, he is perhaps best known for the part he played in the Investiture Controversy, his dispute with Henry IV, Holy Roman Emperor affirming the primacy of the papal...

 concerning who would appoint bishops (investiture
Investiture
Investiture, from the Latin is a rather general term for the formal installation of an incumbent...

). The end of lay investiture threatened to undercut the power of the Empire and the ambitions of noblemen for the benefit of Church reform.

Bishops collected revenues from estates attached to their bishopric. Noblemen who held lands (fiefdoms) hereditarily passed those lands on within their family. However, because bishops had no legitimate children, when a bishop died it was the king's right to appoint a successor. So, while a king had little recourse in preventing noblemen from acquiring powerful domains via inheritance and dynastic marriages, a king could keep careful control of lands under the domain of his bishops. Kings would bestow bishoprics to members of noble families whose friendship he wished to secure. Furthermore, if a king left a bishopric vacant, then he collected the estates' revenues until a bishop was appointed, when in theory he was to repay the earnings. The infrequence of this repayment was an obvious source of dispute. The Church wanted to end this lay investiture because of the potential corruption, not only from vacant sees but also from other practices such as simony
Simony
Simony is the act of paying for sacraments and consequently for holy offices or for positions in the hierarchy of a church, named after Simon Magus , who appears in the Acts of the Apostles 8:9-24...

. Thus, the Investiture Contest was part of the Church's attempt to reform the episcopate and provide better pastoral care
Pastoral care
Pastoral care is the ministry of care and counseling provided by pastors, chaplains and other religious leaders to members of their church or congregation, or to persons of all faiths and none within institutional settings. This can range anywhere from home visitation to formal counseling provided...

.

Pope Gregory VII issued the Dictatus Papae
Dictatus papae
Dictatus papae is a compilation of 27 axiomatic statements of powers arrogated to the Pope that was included in Pope Gregory VII's register under the year 1075. Some historians argue that it was written by Gregory VII himself; others argue that it has been inserted in the register at a later...

, which declared that the pope alone could appoint or depose bishops, or translate them to other sees. Henry VI's rejection of the decree lead to his excommunication and a ducal revolt; eventually Henry received absolution after dramatic public penance barefoot in Alpine snow and cloaked in a hairshirt (see Walk to Canossa
Walk to Canossa
The Walk to Canossa refers to both the trek itself of Henry IV of the Holy Roman Empire from Speyer to the fortress at Canossa in Emilia Romagna and to the events surrounding his journey, which took place in and around January 1077.-Historical background:When, in his early...

), though the revolt and conflict of investiture continued. Likewise, a similar controversy occurred in England between King Henry I
Henry I of England
Henry I was the fourth son of William I of England. He succeeded his elder brother William II as King of England in 1100 and defeated his eldest brother, Robert Curthose, to become Duke of Normandy in 1106...

 and St. Anselm
Anselm of Canterbury
Anselm of Canterbury , also called of Aosta for his birthplace, and of Bec for his home monastery, was a Benedictine monk, a philosopher, and a prelate of the church who held the office of Archbishop of Canterbury from 1093 to 1109...

, Archbishop of Canterbury, over investiture and ecclesiastical revenues collected by the king during an episcopal vacancy. The English dispute was resolved by the Concordat of London, 1107, where the king renounced his claim to invest bishops but continued to require an oath of fealty from them upon their election. This was a partial model for the Concordat of Worms
Concordat of Worms
The Concordat of Worms, sometimes called the Pactum Calixtinum by papal historians, was an agreement between Pope Calixtus II and Holy Roman Emperor Henry V on September 23, 1122 near the city of Worms...

 (Pactum Calixtinum), which resolved the Imperial investiture controversy with a compromise that allowed secular authorities some measure of control but granted the selection of bishops to their cathedral canons
Canon (priest)
A canon is a priest or minister who is a member of certain bodies of the Christian clergy subject to an ecclesiastical rule ....

. As a symbol of the compromise, lay authorities invested bishops with their secular authority symbolised by the lance, and ecclesiastical authorities invested bishops with their spiritual authority symbolised by the ring
Ecclesiastical ring
An ecclesiastical ring is a finger ring worn by a clergyman, such as a Bishop's ring.-Historical antecedents:St. Clement of Alexandria says that a man might lawfully wear a ring on his little finger, and that it should bear some religious emblem—a dove for the Holy Spirit, a fish for Christ or an...

 and the staff.

Crusades

The Crusades were a series of military conflicts conducted by Christian knights for the defence of Christians and for the expansion of Christian domains. Generally, the crusades refer to the campaigns in the Holy Land against Muslim forces sponsored by the Papacy. There were other crusades against Islamic forces in southern Spain, southern Italy, and Sicily, as well as the campaigns of Teutonic knights against pagan strongholds in Eastern Europe (see Northern Crusades
Northern Crusades
The Northern Crusades or Baltic Crusades were crusades undertaken by the Christian kings of Denmark and Sweden, the German Livonian and Teutonic military orders, and their allies against the pagan peoples of Northern Europe around the southern and eastern shores of the Baltic Sea...

). A few crusades such as the Fourth Crusade
Fourth Crusade
The Fourth Crusade was originally intended to conquer Muslim-controlled Jerusalem by means of an invasion through Egypt. Instead, in April 1204, the Crusaders of Western Europe invaded and conquered the Christian city of Constantinople, capital of the Eastern Roman Empire...

 were waged within Christendom against groups that were considered heretical and schismatic (also see the Battle of the Ice
Battle of the Ice
The Battle of the Ice , also known as the Battle of Lake Peipus , was a battle between the Republic of Novgorod and the Livonian branch of the Teutonic Knights on April 5, 1242, at Lake Peipus...

 and the Albigensian Crusade
Albigensian Crusade
The Albigensian Crusade or Cathar Crusade was a 20-year military campaign initiated by the Catholic Church to eliminate Catharism in Languedoc...

).

The Holy Land had been part of the Roman Empire, and thus Byzantine Empire, until the Islamic conquests of the seventh and eighth centuries. Thereafter, Christians had generally been permitted to visit the sacred places in the Holy Land until 1071, when the Seljuk Turks closed Christian pilgrimages and assailed the Byzantines, defeating them at the Battle of Manzikert
Battle of Manzikert
The Battle of Manzikert , was fought between the Byzantine Empire and Seljuq Turks led by Alp Arslan on August 26, 1071 near Manzikert...

. Emperor Alexius I
Alexius I
Alexius I may refer to:*Alexios I Komnenos , Byzantine Emperor *Alexios I of Trebizond , great-great-grandson of the above, Emperor of Trapezunt...

 asked for aid from Pope Urban II
Pope Urban II
Pope Urban II , born Otho de Lagery , was Pope from 12 March 1088 until his death on July 29 1099...

 (1088–1099) for help against Islamic aggression. He probably expected money from the pope for the hiring of mercenaries. Instead, Urban II called upon the knights of Christendom in a speech made at the Council of Clermont
Council of Clermont
The Council of Clermont was a mixed synod of ecclesiastics and laymen of the Catholic Church, which was held from November 18 to November 28, 1095 at Clermont, France...

 on 27 November 1095, combining the idea of pilgrimage to the Holy Land with that of waging a holy war against infidels.

The First Crusade
First Crusade
The First Crusade was a military expedition by Western Christianity to regain the Holy Lands taken in the Muslim conquest of the Levant, ultimately resulting in the recapture of Jerusalem...

 captured Antioch in 1099 and then Jerusalem. The Second Crusade
Second Crusade
The Second Crusade was the second major crusade launched from Europe. The Second Crusade was started in response to the fall of the County of Edessa the previous year to the forces of Zengi. The county had been founded during the First Crusade by Baldwin of Boulogne in 1098...

 occurred in 1145 when Edessa
County of Edessa
The County of Edessa was one of the Crusader states in the 12th century, based around Edessa, a city with an ancient history and an early tradition of Christianity....

 was retaken by Islamic forces. Jerusalem would be held until 1187 and the Third Crusade
Third Crusade
The Third Crusade , also known as the Kings' Crusade, was an attempt by European leaders to reconquer the Holy Land from Saladin...

, famous for the battles between Richard the Lionheart
Richard I of England
Richard I was King of England from 6 July 1189 until his death. He also ruled as Duke of Normandy, Duke of Aquitaine, Duke of Gascony, Lord of Cyprus, Count of Anjou, Count of Maine, Count of Nantes, and Overlord of Brittany at various times during the same period...

 and Saladin
Saladin
Ṣalāḥ ad-Dīn Yūsuf ibn Ayyūb , better known in the Western world as Saladin, was an Arabized Kurdish Muslim, who became the first Sultan of Egypt and Syria, and founded the Ayyubid dynasty. He led Muslim and Arab opposition to the Franks and other European Crusaders in the Levant...

. The Fourth Crusade
Fourth Crusade
The Fourth Crusade was originally intended to conquer Muslim-controlled Jerusalem by means of an invasion through Egypt. Instead, in April 1204, the Crusaders of Western Europe invaded and conquered the Christian city of Constantinople, capital of the Eastern Roman Empire...

, begun by Innocent III in 1202, intended to retake the Holy Land but was soon subverted by Venetians who used the forces to sack the Christian city of Zara
Zadar
Zadar is a city in Croatia on the Adriatic Sea. It is the centre of Zadar county and the wider northern Dalmatian region. Population of the city is 75,082 citizens...

. Innocent excommunicated the Venetians and crusaders. Eventually the crusaders arrived in Constantinople, but due to strife which arose between them and the Byzantines
Byzantine Empire
The Byzantine Empire was the Eastern Roman Empire during the periods of Late Antiquity and the Middle Ages, centred on the capital of Constantinople. Known simply as the Roman Empire or Romania to its inhabitants and neighbours, the Empire was the direct continuation of the Ancient Roman State...

, rather than proceed to the Holy Land the crusaders instead sacked Constantinople and other parts of Asia Minor effectively establishing the Latin Empire
Latin Empire
The Latin Empire or Latin Empire of Constantinople is the name given by historians to the feudal Crusader state founded by the leaders of the Fourth Crusade on lands captured from the Byzantine Empire. It was established after the capture of Constantinople in 1204 and lasted until 1261...

 of Constantinople in Greece and Asia Minor. This was effectively the last crusade sponsored by the papacy; later crusades were sponsored by individuals. Thus, though Jerusalem was held for nearly a century and other strongholds in the Near East would remain in Christian possession much longer, the crusades in the Holy Land ultimately failed to establish permanent Christian kingdoms. Islamic expansion into Europe would renew and remain a threat for centuries culminating in the campaigns of Suleiman the Magnificent
Suleiman the Magnificent
Suleiman I was the tenth and longest-reigning Sultan of the Ottoman Empire, from 1520 to his death in 1566. He is known in the West as Suleiman the Magnificent and in the East, as "The Lawgiver" , for his complete reconstruction of the Ottoman legal system...

 in the sixteenth century. On the other hand, the crusades in southern Spain, southern Italy, and Sicily eventually lead to the demise of Islamic power in the regions; the Teutonic knights expanded Christian domains in Eastern Europe, and the much less frequent crusades within Christendom, such as the Albigensian Crusade
Albigensian Crusade
The Albigensian Crusade or Cathar Crusade was a 20-year military campaign initiated by the Catholic Church to eliminate Catharism in Languedoc...

, achieved their goal of maintaining doctrinal unity.

Medieval inquisition

The first medieval inquisition
Medieval Inquisition
The Medieval Inquisition is a series of Inquisitions from around 1184, including the Episcopal Inquisition and later the Papal Inquisition...

 was established around 1184 to suppress what the Church considered apostasy
Apostasy
Apostasy , 'a defection or revolt', from ἀπό, apo, 'away, apart', στάσις, stasis, 'stand, 'standing') is the formal disaffiliation from or abandonment or renunciation of a religion by a person. One who commits apostasy is known as an apostate. These terms have a pejorative implication in everyday...

 or heresy
Christian heresy
Christian heresy refers to non-orthodox practices and beliefs that were deemed to be heretical by one or more of the Christian churches. In Western Christianity, the term "heresy" most commonly refers to those beliefs which were declared to be anathema by the Catholic Church prior to the schism of...

. The main targets were the Cathars and the Waldensians
Waldensians
Waldensians, Waldenses or Vaudois are names for a Christian movement of the later Middle Ages, descendants of which still exist in various regions, primarily in North-Western Italy. There is considerable uncertainty about the earlier history of the Waldenses because of a lack of extant source...

 in southern France and northern Italy. There were many inquisitions. The inquisitions in combination with the Albigensian Crusade
Albigensian Crusade
The Albigensian Crusade or Cathar Crusade was a 20-year military campaign initiated by the Catholic Church to eliminate Catharism in Languedoc...

 were fairly successful in suppressing heresy.

Rise of universities

Modern western universities have their origins directly in the Medieval Church. They began as cathedral schools, and all students were considered clerics. This was a benefit as it placed the students under ecclesiastical jurisdiction and thus imparted certain legal immunities and protections. The cathedral schools eventually became partially detached from the cathedrals and formed their own institutions, the earliest being the University of Paris
University of Paris
The University of Paris was a university located in Paris, France and one of the earliest to be established in Europe. It was founded in the mid 12th century, and officially recognized as a university probably between 1160 and 1250...

 (c. 1150), the University of Bologna
University of Bologna
The Alma Mater Studiorum - University of Bologna is the oldest continually operating university in the world, the word 'universitas' being first used by this institution at its foundation. The true date of its founding is uncertain, but believed by most accounts to have been 1088...

 (1088), and the University of Oxford
University of Oxford
The University of Oxford is a university located in Oxford, United Kingdom. It is the second-oldest surviving university in the world and the oldest in the English-speaking world. Although its exact date of foundation is unclear, there is evidence of teaching as far back as 1096...

 (1096). Universities as institutions that issue academic degree
Academic degree
An academic degree is a position and title within a college or university that is usually awarded in recognition of the recipient having either satisfactorily completed a prescribed course of study or having conducted a scholarly endeavour deemed worthy of his or her admission to the degree...

s were inspired by Islamic madrasah
Madrasah
Madrasah is the Arabic word for any type of educational institution, whether secular or religious...

s founded in the ninth century. For instance, the University of Al Karaouine in Fez, Morocco is thus recognized by the Guinness Book of World Records as the oldest degree-granting university in the world with its founding in 859 by the princess Fatima al-Fihri.

Conversion of the Scandinavians

Early evangelisation in Scandinavia was begun by Ansgar
Ansgar
Saint Ansgar, Anskar or Oscar, was an Archbishop of Hamburg-Bremen. The see of Hamburg was designated a "Mission to bring Christianity to the North", and Ansgar became known as the "Apostle of the North".-Life:After his mother’s early death Ansgar was brought up in Corbie Abbey, and made rapid...

, Archbishop of Bremen
Archbishopric of Bremen
The Archdiocese of Bremen was a historical Roman Catholic diocese and formed from 1180 to 1648 an ecclesiastical state , named Prince-Archbishopric of Bremen within the Holy Roman Empire...

, "Apostle of the North". Ansgar, a native of Amiens
Amiens
Amiens is a city and commune in northern France, north of Paris and south-west of Lille. It is the capital of the Somme department in Picardy...

, was sent with a group of monks to Jutland Denmark
Denmark
Denmark is a Scandinavian country in Northern Europe. The countries of Denmark and Greenland, as well as the Faroe Islands, constitute the Kingdom of Denmark . It is the southernmost of the Nordic countries, southwest of Sweden and south of Norway, and bordered to the south by Germany. Denmark...

 in around 820 at the time of the pro-Christian Jutish king Harald Klak. The mission was only partially successful, and Ansgar returned two years later to Germany, after Harald had been driven out of his kingdom. In 829 Ansgar went to Birka on Lake Mälaren, Sweden, with his aide friar Witmar, and a small congregation was formed in 831 which included the king's own steward Hergeir. Conversion was slow, however, and most Scandinavian lands were only completely Christianised at the time of rulers such as Saint Canute IV of Denmark and Olaf I of Norway
Olaf I of Norway
Olaf Tryggvason was King of Norway from 995 to 1000. He was the son of Tryggvi Olafsson, king of Viken , and, according to later sagas, the great-grandson of Harald Fairhair, first King of Norway.Olaf played an important part in the often forcible, on pain of torture or death, conversion of the...

 in the years following AD 1000.

Conversion of East and South Slavs

Though by 800 Western Europe was ruled entirely by Christian kings, Eastern Europe remained an area of missionary activity. For example, in the ninth century SS. Cyril and Methodius had extensive missionary success in Eastern Europe among the Slavic peoples
Slavic peoples
The Slavic people are an Indo-European panethnicity living in Eastern Europe, Southeast Europe, North Asia and Central Asia. The term Slavic represents a broad ethno-linguistic group of people, who speak languages belonging to the Slavic language family and share, to varying degrees, certain...

, translating the Bible and liturgy into Slavonic
Old Church Slavonic
Old Church Slavonic or Old Church Slavic was the first literary Slavic language, first developed by the 9th century Byzantine Greek missionaries Saints Cyril and Methodius who were credited with standardizing the language and using it for translating the Bible and other Ancient Greek...

. The Baptism of Kiev in the 988 spread Christianity throughout Kievan Rus'
Kievan Rus'
Kievan Rus was a medieval polity in Eastern Europe, from the late 9th to the mid 13th century, when it disintegrated under the pressure of the Mongol invasion of 1237–1240....

, establishing Christianity among the Ukraine
Ukraine
Ukraine is a country in Eastern Europe. It has an area of 603,628 km², making it the second largest contiguous country on the European continent, after Russia...

, Belarus
Belarus
Belarus , officially the Republic of Belarus, is a landlocked country in Eastern Europe, bordered clockwise by Russia to the northeast, Ukraine to the south, Poland to the west, and Lithuania and Latvia to the northwest. Its capital is Minsk; other major cities include Brest, Grodno , Gomel ,...

 and Russia
Russia
Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

.

In the ninth and tenth centuries, Christianity made great inroads into Eastern Europe
Eastern Europe
Eastern Europe is the eastern part of Europe. The term has widely disparate geopolitical, geographical, cultural and socioeconomic readings, which makes it highly context-dependent and even volatile, and there are "almost as many definitions of Eastern Europe as there are scholars of the region"...

, including Kievan Rus'
Kievan Rus'
Kievan Rus was a medieval polity in Eastern Europe, from the late 9th to the mid 13th century, when it disintegrated under the pressure of the Mongol invasion of 1237–1240....

. The evangelisation, or Christianisation, of the Slavs was initiated by one of Byzantium's most learned churchmen — the Patriarch Photius. The Byzantine emperor Michael III chose Cyril and Methodius in response to a request from Rastislav, the king of Moravia who wanted missionaries that could minister to the Moravians in their own language. The two brothers spoke the local Slavonic vernacular and translated the Bible
Bible
The Bible refers to any one of the collections of the primary religious texts of Judaism and Christianity. There is no common version of the Bible, as the individual books , their contents and their order vary among denominations...

 and many of the prayer books. As the translations prepared by them were copied by speakers of other dialects, the hybrid literary language Old Church Slavonic
Old Church Slavonic
Old Church Slavonic or Old Church Slavic was the first literary Slavic language, first developed by the 9th century Byzantine Greek missionaries Saints Cyril and Methodius who were credited with standardizing the language and using it for translating the Bible and other Ancient Greek...

 was created.

Methodius later went on to convert the Serbs
Serbs
The Serbs are a South Slavic ethnic group of the Balkans and southern Central Europe. Serbs are located mainly in Serbia, Montenegro and Bosnia and Herzegovina, and form a sizable minority in Croatia, the Republic of Macedonia and Slovenia. Likewise, Serbs are an officially recognized minority in...

. Some of the disciples returned to Bulgaria
Bulgaria
Bulgaria , officially the Republic of Bulgaria , is a parliamentary democracy within a unitary constitutional republic in Southeast Europe. The country borders Romania to the north, Serbia and Macedonia to the west, Greece and Turkey to the south, as well as the Black Sea to the east...

 where they were welcomed by the Bulgarian Tsar
Tsar
Tsar is a title used to designate certain European Slavic monarchs or supreme rulers. As a system of government in the Tsardom of Russia and Russian Empire, it is known as Tsarist autocracy, or Tsarism...

 Boris I
Boris I of Bulgaria
Boris I, also known as Boris-Mihail and Bogoris was the Knyaz of First Bulgarian Empire in 852–889. At the time of his baptism in 864, Boris was named Michael after his godfather, Emperor Michael III...

 who viewed the Slavonic liturgy as a way to counteract Greek influence in the country. In a short time the disciples of Cyril and Methodius managed to prepare and instruct the future Slavic clergy into the Glagolitic alphabet
Glagolitic alphabet
The Glagolitic alphabet , also known as Glagolitsa, is the oldest known Slavic alphabet. The name was not coined until many centuries after its creation, and comes from the Old Slavic glagolъ "utterance" . The verb glagoliti means "to speak"...

 and the biblical texts. Methodius and Cyril were mainly living and working in the Macedonian city of Ohrid
Ohrid
Ohrid is a city on the eastern shore of Lake Ohrid in the Republic of Macedonia. It has about 42,000 inhabitants, making it the seventh largest city in the country. The city is the seat of Ohrid Municipality. Ohrid is notable for having once had 365 churches, one for each day of the year and has...

, which they made the religious capital of the Balkans
Balkans
The Balkans is a geopolitical and cultural region of southeastern Europe...

.

Bulgaria was officially recognised as a patriarchate by Constantinople in 945, Serbia in 1346, and Russia in 1589. All these nations, however, had been converted long before these dates.

The missionaries to the East and South Slavs had great success in part because they used the people's native language rather than Latin
Latin
Latin is an Italic language originally spoken in Latium and Ancient Rome. It, along with most European languages, is a descendant of the ancient Proto-Indo-European language. Although it is considered a dead language, a number of scholars and members of the Christian clergy speak it fluently, and...

 as the Roman priests did, or Greek
Greek language
Greek is an independent branch of the Indo-European family of languages. Native to the southern Balkans, it has the longest documented history of any Indo-European language, spanning 34 centuries of written records. Its writing system has been the Greek alphabet for the majority of its history;...

.

Mission to Great Moravia

When Rastislav
Rastislav
Rastislav or Rostislav was the second known ruler of Moravia . Although he started his reign as vassal to Louis the German, king of East Francia, he consolidated his rule to the extent that after 855 he was able to repel a series of Frankish attacks...

, the king of Great Moravia
Great Moravia
Great Moravia was a Slavic state that existed in Central Europe and lasted for nearly seventy years in the 9th century whose creators were the ancestors of the Czechs and Slovaks. It was a vassal state of the Germanic Frankish kingdom and paid an annual tribute to it. There is some controversy as...

 and a known wizard, asked Byzantium for teachers who could minister to the Moravians in their own language, Byzantine emperor Michael III chose two brothers, Cyril and Methodius. As their mother was a Slav from the hinterlands of Thessaloniki, the two brothers had been raised speaking the local Slavonic vernacular. Once commissioned, they immediately set about creating an alphabet, the Cyrillic alphabet
Cyrillic alphabet
The Cyrillic script or azbuka is an alphabetic writing system developed in the First Bulgarian Empire during the 10th century AD at the Preslav Literary School...

; they then translated the Scripture and the liturgy into Slavonic. This Slavic dialect became the basis of Old Church Slavonic
Old Church Slavonic
Old Church Slavonic or Old Church Slavic was the first literary Slavic language, first developed by the 9th century Byzantine Greek missionaries Saints Cyril and Methodius who were credited with standardizing the language and using it for translating the Bible and other Ancient Greek...

 which later evolved into Church Slavonic which is the common liturgical language still used by the Russian Orthodox Church and other Slavic Orthodox Christians. The missionaries to the East and South Slavs had great success in part because they used the people's native language rather than Latin
Latin
Latin is an Italic language originally spoken in Latium and Ancient Rome. It, along with most European languages, is a descendant of the ancient Proto-Indo-European language. Although it is considered a dead language, a number of scholars and members of the Christian clergy speak it fluently, and...

 or Greek
Greek language
Greek is an independent branch of the Indo-European family of languages. Native to the southern Balkans, it has the longest documented history of any Indo-European language, spanning 34 centuries of written records. Its writing system has been the Greek alphabet for the majority of its history;...

. In Great Moravia, Constantine and Methodius encountered Frankish missionaries from Germany, representing the western or Latin branch of the Church, and more particularly representing the Holy Roman Empire as founded by Charlemagne, and committed to linguistic, and cultural uniformity. They insisted on the use of the Latin liturgy, and they regarded Moravia and the Slavic peoples as part of their rightful mission field.

When friction developed, the brothers, unwilling to be a cause of dissension among Christians, travelled to Rome to see the Pope, seeking an agreement that would avoid quarrelling between missionaries in the field. Constantine entered a monastery in Rome, taking the name Cyril, by which he is now remembered. However, he died only a few weeks thereafter.

Pope Adrian II
Pope Adrian II
Pope Adrian II , , pope from December 14, 867 to December 14, 872, was a member of a noble Roman family, and became pope in 867, at an advanced age....

 gave Methodius the title of Archbishop of Sirmium (now Sremska Mitrovica in Serbia) and sent him back in 869, with jurisdiction over all of Moravia and Pannonia, and authorisation to use the Slavonic Liturgy. Soon, however, Prince Ratislav, who had originally invited the brothers to Moravia, died, and his successor did not support Methodius. In 870 the Frankish king Louis and his bishops deposed Methodius at a synod at Ratisbon, and imprisoned him for a little over two years. Pope John VIII
Pope John VIII
Pope John VIII was pope from December 13, 872 to December 16, 882. He is often considered one of the ablest pontiffs of the ninth century and the last bright spot on the papacy until Leo IX two centuries later....

 secured his release, but instructed him to stop using the Slavonic Liturgy.

In 878, Methodius was summoned to Rome on charges of heresy and using Slavonic. This time Pope John was convinced by the arguments that Methodius made in his defence and sent him back cleared of all charges, and with permission to use Slavonic. The Carolingian bishop who succeeded him, Witching, suppressed the Slavonic Liturgy and forced the followers of Methodius into exile. Many found refuge with King Boris
Boris I of Bulgaria
Boris I, also known as Boris-Mihail and Bogoris was the Knyaz of First Bulgarian Empire in 852–889. At the time of his baptism in 864, Boris was named Michael after his godfather, Emperor Michael III...

 of Bulgaria
Bulgaria
Bulgaria , officially the Republic of Bulgaria , is a parliamentary democracy within a unitary constitutional republic in Southeast Europe. The country borders Romania to the north, Serbia and Macedonia to the west, Greece and Turkey to the south, as well as the Black Sea to the east...

 (852–889), under whom they reorganised a Slavic-speaking Church. Meanwhile, Pope John's successors adopted a Latin-only policy which lasted for centuries.

Conversion of the Serbs and Bulgarians

Methodius later went on to convert the Serbs
Serbs
The Serbs are a South Slavic ethnic group of the Balkans and southern Central Europe. Serbs are located mainly in Serbia, Montenegro and Bosnia and Herzegovina, and form a sizable minority in Croatia, the Republic of Macedonia and Slovenia. Likewise, Serbs are an officially recognized minority in...

. Some of the disciples, namely St. Kliment, St. Naum who were of noble Bulgarian
Bulgarians
The Bulgarians are a South Slavic nation and ethnic group native to Bulgaria and neighbouring regions. Emigration has resulted in immigrant communities in a number of other countries.-History and ethnogenesis:...

 descent and St. Angelaruis, returned to Bulgaria
Bulgaria
Bulgaria , officially the Republic of Bulgaria , is a parliamentary democracy within a unitary constitutional republic in Southeast Europe. The country borders Romania to the north, Serbia and Macedonia to the west, Greece and Turkey to the south, as well as the Black Sea to the east...

 where they were welcomed by the Bulgarian Tsar
Tsar
Tsar is a title used to designate certain European Slavic monarchs or supreme rulers. As a system of government in the Tsardom of Russia and Russian Empire, it is known as Tsarist autocracy, or Tsarism...

 Boris I
Boris I of Bulgaria
Boris I, also known as Boris-Mihail and Bogoris was the Knyaz of First Bulgarian Empire in 852–889. At the time of his baptism in 864, Boris was named Michael after his godfather, Emperor Michael III...

 who viewed the Slavonic liturgy as a way to counteract Greek influence in the country. In a short time the disciples of Cyril and Methodius managed to prepare and instruct the future Slav Bulgarian clergy into the Glagolitic alphabet
Glagolitic alphabet
The Glagolitic alphabet , also known as Glagolitsa, is the oldest known Slavic alphabet. The name was not coined until many centuries after its creation, and comes from the Old Slavic glagolъ "utterance" . The verb glagoliti means "to speak"...

 and the biblical texts and in AD 893, Bulgaria expelled its Greek clergy and proclaimed the Slavonic language
Bulgarian language
Bulgarian is an Indo-European language, a member of the Slavic linguistic group.Bulgarian, along with the closely related Macedonian language, demonstrates several linguistic characteristics that set it apart from all other Slavic languages such as the elimination of case declension, the...

 as the official language of the church and the state.

Conversion of the Rus'

The success of the conversion of the Bulgarians facilitated the conversion of other East Slavic peoples
Slavic peoples
The Slavic people are an Indo-European panethnicity living in Eastern Europe, Southeast Europe, North Asia and Central Asia. The term Slavic represents a broad ethno-linguistic group of people, who speak languages belonging to the Slavic language family and share, to varying degrees, certain...

, most notably the Rus'
Rus' (people)
The Rus' were a group of Varangians . According to the Primary Chronicle of Rus, compiled in about 1113 AD, the Rus had relocated from the Baltic region , first to Northeastern Europe, creating an early polity which finally came under the leadership of Rurik...

, predecessors of Belarusians
Belarusians
Belarusians ; are an East Slavic ethnic group who populate the majority of the Republic of Belarus. Introduced to the world as a new state in the early 1990s, the Republic of Belarus brought with it the notion of a re-emerging Belarusian ethnicity, drawn upon the lines of the Old Belarusian...

, Russians
Russians
The Russian people are an East Slavic ethnic group native to Russia, speaking the Russian language and primarily living in Russia and neighboring countries....

, and Ukrainians
Ukrainians
Ukrainians are an East Slavic ethnic group native to Ukraine, which is the sixth-largest nation in Europe. The Constitution of Ukraine applies the term 'Ukrainians' to all its citizens...

, as well as Rusyns
Rusyns
Carpatho-Rusyns are a primarily diasporic ethnic group who speak an Eastern Slavic language, or Ukrainian dialect, known as Rusyn. Carpatho-Rusyns descend from a minority of Ruthenians who did not adopt the use of the ethnonym "Ukrainian" in the early twentieth century...

. By the beginning of the eleventh century most of the pagan Slavic world, including Russia, Bulgaria and Serbia, had been converted to Byzantine Christianity.

The traditional event associated with the conversion of Russia is the baptism of Vladimir of Kiev in 989, on which occasion he was also married to the Byzantine princess Anna, the sister of the Byzantine Emperor Basil II
Basil II
Basil II , known in his time as Basil the Porphyrogenitus and Basil the Young to distinguish him from his ancestor Basil I the Macedonian, was a Byzantine emperor from the Macedonian dynasty who reigned from 10 January 976 to 15 December 1025.The first part of his long reign was dominated...

. However, Christianity is documented to have predated this event in the city of Kiev and in Georgia.

Today the Russian Orthodox Church
Russian Orthodox Church
The Russian Orthodox Church or, alternatively, the Moscow Patriarchate The ROC is often said to be the largest of the Eastern Orthodox churches in the world; including all the autocephalous churches under its umbrella, its adherents number over 150 million worldwide—about half of the 300 million...

 is the largest of the Orthodox Churches.

Late Middle Ages (1300–1499)

Hesychast Controversy

Barlaam of Calabria
About the year 1337 Hesychasm
Hesychasm
Hesychasm is an eremitic tradition of prayer in the Eastern Orthodox Church, and some of the Eastern Catholic Churches, such as the Byzantine Rite, practised by the Hesychast Hesychasm is an eremitic tradition of prayer in the Eastern Orthodox Church, and some of the Eastern Catholic Churches,...

 attracted the attention of a learned member of the Orthodox Church, Barlaam of Calabria
Barlaam of Calabria
Barlaam of Seminara , ca. 1290-1348, or Barlaam of Calabria was a southern Italian scholar and clergyman of the 14th century. Humanist, philologist, and theologian. He brought an accusation of heresy against Gregory Palamas for the latter's defence of Hesychasm...

 who at that time held the office of abbot in the Monastery of St Saviour's in Constantinople and who visited Mount Athos. Mount Athos
Mount Athos
Mount Athos is a mountain and peninsula in Macedonia, Greece. A World Heritage Site, it is home to 20 Eastern Orthodox monasteries and forms a self-governed monastic state within the sovereignty of the Hellenic Republic. Spiritually, Mount Athos comes under the direct jurisdiction of the...

 was then at the height of its fame and influence under the reign of Andronicus III Palaeologus and under the 'first-ship' of the Protos Symeon. On Mount Athos, Barlaam encountered Hesychasts and heard descriptions of their practices, also reading the writings of the teacher in Hesychasm of St Gregory Palamas
Gregory Palamas
Gregory Palamas was a monk of Mount Athos in Greece and later the Archbishop of Thessaloniki known as a preeminent theologian of Hesychasm. The teachings embodied in his writings defending Hesychasm against the attack of Barlaam are sometimes referred to as Palamism, his followers as Palamites...

, himself an Athonite monk. Trained in Western Scholastic
Scholasticism
Scholasticism is a method of critical thought which dominated teaching by the academics of medieval universities in Europe from about 1100–1500, and a program of employing that method in articulating and defending orthodoxy in an increasingly pluralistic context...

 theology, Barlaam was scandalised by Hesychasm and began to combat it both orally and in his writings. As a private teacher of theology in the Western Scholastic mode, Barlaam propounded a more intellectual and propositional approach to the knowledge of God than the Hesychasts taught. Hesychasm is a form of constant purposeful prayer or experiential prayer, explicitly referred to as contemplation
Theoria
For other uses of the term "contemplation", see Contemplation Theoria is Greek for contemplation. It corresponds to the Latin word contemplatio, "looking at", "gazing at", "being aware of".- Introduction :...

. Descriptions of the Hesychast practices can be found in the Philokalia
Philokalia
The Philokalia is a collection of texts written between the 4th and 15th centuries by spiritual masters of the Eastern Orthodox hesychast tradition. They were originally written for the guidance and instruction of monks in "the practise of the contemplative life". The collection was compiled in...

, The Way of a Pilgrim
The Way of a Pilgrim
The Way of a Pilgrim is the English title of a 19th century Russian work, recounting the narrator's journey as a mendicant pilgrim across Russia while practicing the Jesus Prayer. It is unknown if the book is literally an account of a single pilgrim, or if it uses a fictional pilgrim's journey as a...

, and St. John Climacus
John Climacus
Saint John Climacus , also known as John of the Ladder, John Scholasticus and John Sinaites, was a 7th century Christian monk at the monastery on Mount Sinai. He is revered as a saint by the Roman Catholic, Oriental Orthodox, Eastern Orthodox and Eastern Catholic churches.We have almost no...

' The Ladder of Divine Ascent
The Ladder of Divine Ascent
The Ladder of Divine Ascent, or Ladder of Paradise , is an important ascetical treatise for monasticism in Eastern Christianity written by John Climacus in ca...

.

Barlaam took exception to, as heretical
Christian heresy
Christian heresy refers to non-orthodox practices and beliefs that were deemed to be heretical by one or more of the Christian churches. In Western Christianity, the term "heresy" most commonly refers to those beliefs which were declared to be anathema by the Catholic Church prior to the schism of...

 and blasphemous
Blasphemy
Blasphemy is irreverence towards religious or holy persons or things. Some countries have laws to punish blasphemy, while others have laws to give recourse to those who are offended by blasphemy...

, the doctrine entertained by the Hesychasts as to the nature of the uncreated light, the experience of which was said to be the goal of Hesychast practice. It was maintained by the Hesychasts to be of divine origin and to be identical to that light which had been manifested to Jesus' disciples on Mount Tabor
Mount Tabor
-Places:*Mount Tabor, a hill in Israel near Nazareth believed by many to be the site of the Transfiguration of ChristIn the United States:*Mount Tabor, Indiana, an unincorporated community...

 at the Transfiguration
Transfiguration of Jesus
The Transfiguration of Jesus is an event reported in the New Testament in which Jesus is transfigured and becomes radiant upon a mountain. The Synoptic Gospels describe it, and 2 Peter 1:16-18 refers to it....

. This Barlaam held to be polytheistic
Polytheism
Polytheism is the belief of multiple deities also usually assembled into a pantheon of gods and goddesses, along with their own mythologies and rituals....

, inasmuch as it postulated two eternal substances, a visible and an invisible God.

Gregory Palamas
On the Hesychast side, the controversy was taken up by St Gregory Palamas
Gregory Palamas
Gregory Palamas was a monk of Mount Athos in Greece and later the Archbishop of Thessaloniki known as a preeminent theologian of Hesychasm. The teachings embodied in his writings defending Hesychasm against the attack of Barlaam are sometimes referred to as Palamism, his followers as Palamites...

, afterwards Archbishop of Thessalonica, who was asked by his fellow monks on Mt Athos to defend Hesychasm from the attacks of Barlaam. St Gregory himself, was well-educated in Greek philosophy. St Gregory defended Hesychasm in the 1340s at three different synods in Constantinople
Constantinople
Constantinople was the capital of the Roman, Eastern Roman, Byzantine, Latin, and Ottoman Empires. Throughout most of the Middle Ages, Constantinople was Europe's largest and wealthiest city.-Names:...

, and he also wrote a number of works in its defence.

In these works, St Gregory Palamas uses a distinction, already found in the 4th century in the works of the Cappadocian Fathers
Cappadocian Fathers
The Cappadocian Fathers are Basil the Great , who was bishop of Caesarea; Basil's brother Gregory of Nyssa , who was bishop of Nyssa; and a close friend, Gregory of Nazianzus , who became Patriarch of Constantinople...

, between the energies
Essence-Energies distinction
A real distinction between the essence and the energies of God is a central principle of Eastern Orthodox theology. Eastern Orthodox theology regards this distinction as more than a mere conceptual distinction...

 or operations (Gr. energeies) of God and the essence (ousia
Ousia
Ousia is the Ancient Greek noun formed on the feminine present participle of ; it is analogous to the English participle being, and the modern philosophy adjectival ontic...

) of God (see the Essence-Energies distinction
Essence-Energies distinction
A real distinction between the essence and the energies of God is a central principle of Eastern Orthodox theology. Eastern Orthodox theology regards this distinction as more than a mere conceptual distinction...

). St Gregory taught that the energies or operations of God were uncreated. He taught that the essence of God can never be known by his creations even in the next life, but that his uncreated energies or operations can be known both in this life and in the next, and convey to the Hesychast in this life and to the righteous in the next life a true spiritual knowledge of God (see theoria
Theoria
For other uses of the term "contemplation", see Contemplation Theoria is Greek for contemplation. It corresponds to the Latin word contemplatio, "looking at", "gazing at", "being aware of".- Introduction :...

). In Palamite theology, it is the uncreated energies of God that illumine the Hesychast who has been vouchsafed an experience of the Uncreated Light. Palamas referred to this experience as an apodictic
Apodictic
"Apodictic" or "apodeictic" is an adjectival expression from Aristotelean logic that refers to propositions that are demonstrable, that are necessarily or self-evidently the case or that, conversely, are impossible...

 (see Aristotle
Aristotle
Aristotle was a Greek philosopher and polymath, a student of Plato and teacher of Alexander the Great. His writings cover many subjects, including physics, metaphysics, poetry, theater, music, logic, rhetoric, linguistics, politics, government, ethics, biology, and zoology...

) validation of God rather than a scholastic contemplative
Contemplation
The word contemplation comes from the Latin word contemplatio. Its root is also that of the Latin word templum, a piece of ground consecrated for the taking of auspices, or a building for worship, derived either from Proto-Indo-European base *tem- "to cut", and so a "place reserved or cut out" or...

 or dialectic
Dialectic
Dialectic is a method of argument for resolving disagreement that has been central to Indic and European philosophy since antiquity. The word dialectic originated in Ancient Greece, and was made popular by Plato in the Socratic dialogues...

al validation of God.

Synods
In 1341 the dispute came before a synod
Synod
A synod historically is a council of a church, usually convened to decide an issue of doctrine, administration or application. In modern usage, the word often refers to the governing body of a particular church, whether its members are meeting or not...

 held at Constantinople
Constantinople
Constantinople was the capital of the Roman, Eastern Roman, Byzantine, Latin, and Ottoman Empires. Throughout most of the Middle Ages, Constantinople was Europe's largest and wealthiest city.-Names:...

 and was presided over by the Emperor Andronicus
Andronicus
Andronicus or Andronikos is a classical Greek name , from the Gr. words "andras", , i.e. man and "Nike" , i.e. victory. The name has the sense of "victorious, warrior"...

; the synod, taking into account the regard in which the writings of the pseudo-Dionysius were held, condemned Barlaam, who recanted and returned to Calabria
Calabria
Calabria , in antiquity known as Bruttium, is a region in southern Italy, south of Naples, located at the "toe" of the Italian Peninsula. The capital city of Calabria is Catanzaro....

, afterwards becoming a bishop in the Roman Catholic Church.

One of Barlaam's friends, Gregory Akindynos, who originally was also a friend of St Gregory Palamas, took up the controversy, and three other synods on the subject were held, at the second of which the followers of Barlaam gained a brief victory. But in 1351 at a synod under the presidency of the Emperor John VI Cantacuzenus, Hesychast doctrine was established as the doctrine of the Orthodox Church.

Aftermath
Up to this day, the Roman Catholic Church has never fully accepted Hesychasm, especially the distinction between the energies or operations of God and the essence of God, and the notion that those energies or operations of God are uncreated. In Roman Catholic theology as it has developed since the Scholastic period
Scholasticism
Scholasticism is a method of critical thought which dominated teaching by the academics of medieval universities in Europe from about 1100–1500, and a program of employing that method in articulating and defending orthodoxy in an increasingly pluralistic context...

 circa 1100–1500, the essence of God can be known, but only in the next life; the grace of God is always created; and the essence of God is pure act, so that there can be no distinction between the energies or operations and the essence of God (see, e.g., the Summa Theologiae of St Thomas Aquinas). Some of these positions depend on Aristotelian metaphysics.

Views of modern historians
The contemporary historians Cantacuzenus and Nicephorus Gregoras
Nicephorus Gregoras
Nikephoros Gregoras, latinized as Nicephorus Gregoras , Byzantine astronomer, historian, man of learning and religious controversialist, was born at Heraclea Pontica....

 deal very copiously with this subject, taking the Hesychast and Barlaamite sides respectively. Respected fathers of the church have held that these councils that agree that experiential prayer is Orthodox, refer to these as councils as Ecumenical Councils Eight and Nine.
Father John S. Romanides, Hierotheos (Vlachos) of Nafpaktos, and the Very Rev. Prof. Dr. George Metallinos
George Metallinos
Protopresbyter Fr. George Metallinos is a Greek theologian, priest, historian, author and professor ....

, Professor of theology at Athens Greece (see gnosiology
Gnosiology
The term gnosiology is a term of 18th Century aesthetics, currently used mainly in regard to Eastern Christianity.-Etymology:...

).

Western Schism

The Western Schism, or Papal Schism, was a prolonged period of crisis in Latin Christendom from 1378 to 1416, when there were two or more claimants to the See of Rome and there was conflict concerning the rightful holder of the papacy. The conflict was political, rather than doctrinal, in nature.

In 1309, Pope Clement V
Pope Clement V
Pope Clement V, born Raymond Bertrand de Got was Pope from 1305 to his death...

, due to political considerations, moved to Avignon in southern France and exercised his pontificate there. For sixty-nine years popes resided in Avignon rather than Rome. This was not only an obvious source of not only confusion but of political animosity as the prestige and influence of city of Rome waned without a resident pontiff. Though Pope Gregory XI
Pope Gregory XI
Gregory XI was pope from 1370 until his death.-Biography:He was born Pierre Roger de Beaufort, in Maumont, in the modern commune of Rosiers-d'Égletons, Limousin around 1336. He succeeded Pope Urban V in 1370, and was pope until 1378...

, a Frenchman, returned to Rome in 1378, the strife between Italian and French factions intensified, especially following his subsequent death. In 1378 the conclave, elected an Italian from Naples, Pope Urban VI
Pope Urban VI
Pope Urban VI , born Bartolomeo Prignano, was Pope from 1378 to 1389.-Biography:Born in Itri, he was a devout monk and learned casuist, trained at Avignon. On March 21, 1364, he was consecrated Archbishop of Acerenza in the Kingdom of Naples...

; his intransigence in office soon alienated the French cardinals, who withdrew to a conclave of their own, asserting the previous election was invalid since its decision had been made under the duress of a riotous mob. They elected one of their own, Robert of Geneva, who took the name Pope Clement VII
Pope Clement VII
Clement VII , born Giulio di Giuliano de' Medici, was a cardinal from 1513 to 1523 and was Pope from 1523 to 1534.-Early life:...

. By 1379, he was back in the palace of popes in Avignon, while Urban VI remained in Rome.

For nearly forty years, there were two papal curias and two sets of cardinals, each electing a new pope for Rome or Avignon when death created a vacancy. Each pope lobbied for support among kings and princes who played them off against each other, changing allegiance according to political advantage. In 1409, a council was convened at Pisa to resolve the issue. The council declared both existing popes to be schismatic (Gregory XII from Rome, Benedict XIII from Avignon) and appointed a new one, Alexander V. But the existing popes refused to resign and thus there were three papal claimants. Another council was convened in 1414, the Council of Constance
Council of Constance
The Council of Constance is the 15th ecumenical council recognized by the Roman Catholic Church, held from 1414 to 1418. The council ended the Three-Popes Controversy, by deposing or accepting the resignation of the remaining Papal claimants and electing Pope Martin V.The Council also condemned and...

. In March 1415 the Pisan pope, John XXIII, fled from Constance in disguise; he was brought back a prisoner and deposed in May. The Roman pope, Gregory XII, resigned voluntarily in July. The Avignon pope, Benedict XIII, refused to come to Constance; nor would he consider resignation. The council finally deposed him in July 1417. The council in Constance, having finally cleared the field of popes and antipopes, elected Pope Martin V
Pope Martin V
Pope Martin V , born Odo Colonna, was Pope from 1417 to 1431. His election effectively ended the Western Schism .-Biography:...

 as pope in November.

Italian Renaissance

The Renaissance
Renaissance
The Renaissance was a cultural movement that spanned roughly the 14th to the 17th century, beginning in Italy in the Late Middle Ages and later spreading to the rest of Europe. The term is also used more loosely to refer to the historical era, but since the changes of the Renaissance were not...

 was a period of great cultural change and achievement, marked in Italy by a classical orientation and an increase of wealth through mercantile trade. The City of Rome, the Papacy, and the Papal States were all affected by the Renaissance. On the one hand, it was a time of great artistic patronage and architectural magnificence, where the Church pardoned such artists as Michelangelo
Michelangelo
Michelangelo di Lodovico Buonarroti Simoni , commonly known as Michelangelo, was an Italian Renaissance painter, sculptor, architect, poet, and engineer who exerted an unparalleled influence on the development of Western art...

, Brunelleschi
Filippo Brunelleschi
Filippo Brunelleschi was one of the foremost architects and engineers of the Italian Renaissance. He is perhaps most famous for inventing linear perspective and designing the dome of the Florence Cathedral, but his accomplishments also included bronze artwork, architecture , mathematics,...

, Bramante
Donato Bramante
Donato Bramante was an Italian architect, who introduced the Early Renaissance style to Milan and the High Renaissance style to Rome, where his most famous design was St...

, Raphael
Raphael
Raffaello Sanzio da Urbino , better known simply as Raphael, was an Italian painter and architect of the High Renaissance. His work is admired for its clarity of form and ease of composition and for its visual achievement of the Neoplatonic ideal of human grandeur...

, Fra Angelico
Fra Angelico
Fra Angelico , born Guido di Pietro, was an Early Italian Renaissance painter described by Vasari in his Lives of the Artists as having "a rare and perfect talent"...

, Donatello
Donatello
Donato di Niccolò di Betto Bardi , also known as Donatello, was an early Renaissance Italian artist and sculptor from Florence...

, and da Vinci
Leonardo da Vinci
Leonardo di ser Piero da Vinci was an Italian Renaissance polymath: painter, sculptor, architect, musician, scientist, mathematician, engineer, inventor, anatomist, geologist, cartographer, botanist and writer whose genius, perhaps more than that of any other figure, epitomized the Renaissance...

. On the other hand, wealthy Italian families often secured episcopal offices, including the papacy, for their own members, some of whom were known for immorality, such as Alexander VI
Pope Alexander VI
Pope Alexander VI , born Roderic Llançol i Borja was Pope from 1492 until his death on 18 August 1503. He is one of the most controversial of the Renaissance popes, and his Italianized surname—Borgia—became a byword for the debased standards of the Papacy of that era, most notoriously the Banquet...

 and Sixtus IV
Pope Sixtus IV
Pope Sixtus IV , born Francesco della Rovere, was Pope from 1471 to 1484. His accomplishments as Pope included the establishment of the Sistine Chapel; the group of artists that he brought together introduced the Early Renaissance into Rome with the first masterpiece of the city's new artistic age,...

.

In addition to being the head of the Church, the Pope became one of Italy's most important secular rulers, and pontiffs such as Julius II
Pope Julius II
Pope Julius II , nicknamed "The Fearsome Pope" and "The Warrior Pope" , born Giuliano della Rovere, was Pope from 1503 to 1513...

 often waged campaigns to protect and expand their temporal domains. Furthermore, the popes, in a spirit of refined competition with other Italian lords, spent lavishly both on private luxuries but also on public works, repairing or building churches, bridges, and a magnificent system of aqueducts in Rome that still function today. It was during this time that St. Peter's Basilica
St. Peter's Basilica
The Papal Basilica of Saint Peter , officially known in Italian as ' and commonly known as Saint Peter's Basilica, is a Late Renaissance church located within the Vatican City. Saint Peter's Basilica has the largest interior of any Christian church in the world...

, perhaps the most recognised Christian church, was built on the site of the old Constantinian basilica. It was also a time of increased contact with Greek culture, opening up new avenues of learning, especially in the fields of philosophy
Philosophy
Philosophy is the study of general and fundamental problems, such as those connected with existence, knowledge, values, reason, mind, and language. Philosophy is distinguished from other ways of addressing such problems by its critical, generally systematic approach and its reliance on rational...

, poetry
Poetry
Poetry is a form of literary art in which language is used for its aesthetic and evocative qualities in addition to, or in lieu of, its apparent meaning...

, classics
Classics
Classics is the branch of the Humanities comprising the languages, literature, philosophy, history, art, archaeology and other culture of the ancient Mediterranean world ; especially Ancient Greece and Ancient Rome during Classical Antiquity Classics (sometimes encompassing Classical Studies or...

, rhetoric
Rhetoric
Rhetoric is the art of discourse, an art that aims to improve the facility of speakers or writers who attempt to inform, persuade, or motivate particular audiences in specific situations. As a subject of formal study and a productive civic practice, rhetoric has played a central role in the Western...

, and political science
Political science
Political Science is a social science discipline concerned with the study of the state, government and politics. Aristotle defined it as the study of the state. It deals extensively with the theory and practice of politics, and the analysis of political systems and political behavior...

, fostering a spirit of humanism
Humanism
Humanism is an approach in study, philosophy, world view or practice that focuses on human values and concerns. In philosophy and social science, humanism is a perspective which affirms some notion of human nature, and is contrasted with anti-humanism....

–all of which would influence the Church.

Constantinople falls to the Ottoman Empire

In 1453, Constantinople fell to the Ottoman Empire
Ottoman Empire
The Ottoman EmpireIt was usually referred to as the "Ottoman Empire", the "Turkish Empire", the "Ottoman Caliphate" or more commonly "Turkey" by its contemporaries...

. Under Ottoman rule, the Greek Orthodox Church acquired substantial power as an autonomous millet
Millet (Ottoman Empire)
Millet is a term for the confessional communities in the Ottoman Empire. It refers to the separate legal courts pertaining to "personal law" under which communities were allowed to rule themselves under their own system...

. The ecumenical patriarch was the religious and administrative ruler of the entire "Greek Orthodox nation" (Ottoman administrative unit), which encompassed all the Eastern Orthodox subjects of the Empire. As a result of the Ottoman conquest and the fall of Constantinople
Fall of Constantinople
The Fall of Constantinople was the capture of the capital of the Byzantine Empire, which occurred after a siege by the Ottoman Empire, under the command of Ottoman Sultan Mehmed II, against the defending army commanded by Byzantine Emperor Constantine XI...

, the entire Orthodox communion of the Balkans and the Near East became suddenly isolated from the West. It became confined within a hostile Islamic world, with which it had little in common religiously or culturally.

For the next four hundred years, it would be confined within a hostile Islamic world, with which it had little in common religiously or culturally. This is, in part, due to this geographical and intellectual confinement that the voice of Eastern Orthodoxy was not heard during the Reformation
Protestant Reformation
The Protestant Reformation was a 16th-century split within Western Christianity initiated by Martin Luther, John Calvin and other early Protestants. The efforts of the self-described "reformers", who objected to the doctrines, rituals and ecclesiastical structure of the Roman Catholic Church, led...

 in sixteenth century Europe. As a result, this important theological debate often seems strange and distorted to the Orthodox. They never took part in it and thus neither Reformation nor Counter-Reformation
Counter-Reformation
The Counter-Reformation was the period of Catholic revival beginning with the Council of Trent and ending at the close of the Thirty Years' War, 1648 as a response to the Protestant Reformation.The Counter-Reformation was a comprehensive effort, composed of four major elements:#Ecclesiastical or...

 is part of their theological framework.

Religious rights under the Ottoman Empire
The new Ottoman government
Ottoman Empire
The Ottoman EmpireIt was usually referred to as the "Ottoman Empire", the "Turkish Empire", the "Ottoman Caliphate" or more commonly "Turkey" by its contemporaries...

 that arose from the ashes of Byzantine civilisation was neither primitive nor barbaric. Islam
Islam
Islam . The most common are and .   : Arabic pronunciation varies regionally. The first vowel ranges from ~~. The second vowel ranges from ~~~...

 not only recognised Jesus as a great prophet, but tolerated Christians as another People of the Book
People of the Book
People of the Book is a term used to designate non-Muslim adherents to faiths which have a revealed scripture called, in Arabic, Al-Kitab . The three types of adherents to faiths that the Qur'an mentions as people of the book are the Jews, Sabians and Christians.In Islam, the Muslim scripture, the...

. As such, the Church was not extinguished nor was its canonical and hierarchical organisation significantly disrupted. Its administration continued to function. One of the first things that Mehmet the Conqueror
Mehmed II
Mehmed II , was Sultan of the Ottoman Empire for a short time from 1444 to September 1446, and later from...

 did was to allow the Church to elect a new patriarch, Gennadius Scholarius. The Hagia Sophia
Hagia Sophia
Hagia Sophia is a former Orthodox patriarchal basilica, later a mosque, and now a museum in Istanbul, Turkey...

 and the Parthenon
Parthenon
The Parthenon is a temple on the Athenian Acropolis, Greece, dedicated to the Greek goddess Athena, whom the people of Athens considered their virgin patron. Its construction began in 447 BC when the Athenian Empire was at the height of its power. It was completed in 438 BC, although...

, which had been Christian churches for nearly a millennium were, admittedly, converted into mosques, yet countless other churches, both in Constantinople and elsewhere, remained in Christian hands. Moreover, it is striking that the patriarch's and the hierarchy's position was considerably strengthened and their power increased. They were endowed with civil as well as ecclesiastical power over all Christians in Ottoman territories. Because Islamic law
Sharia
Sharia law, is the moral code and religious law of Islam. Sharia is derived from two primary sources of Islamic law: the precepts set forth in the Quran, and the example set by the Islamic prophet Muhammad in the Sunnah. Fiqh jurisprudence interprets and extends the application of sharia to...

 makes no distinction between nationality and religion, all Christians, regardless of their language or nationality, were considered a single millet
Millet (Ottoman Empire)
Millet is a term for the confessional communities in the Ottoman Empire. It refers to the separate legal courts pertaining to "personal law" under which communities were allowed to rule themselves under their own system...

, or nation. The patriarch, as the highest ranking hierarch, was thus invested with civil and religious authority and made ethnarch
Ethnarch
Ethnarch, pronounced , the anglicized form of ethnarches refers generally to political leadership over a common ethnic group or homogeneous kingdom. The word is derived from the Greek words and ....

, head of the entire Christian Orthodox population. Practically, this meant that all Orthodox Churches within Ottoman territory were under the control of Constantinople. Thus, the authority and jurisdictional frontiers of the patriarch were enormously enlarged.

However, these rights and privileges (see Dhimmitude
Dhimmitude
Dhimmitude is a neologism first found in French denoting an attitude of concession, surrender and appeasement towards Islamic demands. It is derived by adding the productive suffix -tude to the Arabic language adjective dhimmi, which literally means protected and refers to a non-Muslim subject of a...

), including freedom of worship and religious organisation, were often established in principle but seldom corresponded to reality. The legal privileges of the patriarch and the Church depended, in fact, on the whim and mercy of the Sultan
Sultan
Sultan is a title with several historical meanings. Originally, it was an Arabic language abstract noun meaning "strength", "authority", "rulership", and "dictatorship", derived from the masdar سلطة , meaning "authority" or "power". Later, it came to be used as the title of certain rulers who...

 and the Sublime Porte, while all Christians were viewed as little more than second-class citizens. Moreover, Turkish corruption and brutality were not a myth. That it was the "infidel" Christian who experienced this more than anyone else is not in doubt. Nor were pogroms of Christians in these centuries unknown (see Greco-Turkish relations
Greco-Turkish relations
The relations between the Greek and the Turkish states have been marked by alternating periods of mutual hostility and reconciliation ever since Greece won its independence from the Ottoman Empire in 1821...

). Devastating, too, for the Church was the fact that it could not bear witness to Christ. Missionary work among Moslems was dangerous and indeed impossible, whereas conversion to Islam was entirely legal and permissible. Converts to Islam who returned to Orthodoxy were put to death as apostates. No new churches could be built and even the ringing of church bells was prohibited. Education of the clergy and the Christian population either ceased altogether or was reduced to the most rudimentary elements.

See also

  • History of Christian theology
    History of Christian theology
    The doctrine of the Trinity, considered the core of Christian theology by Trinitarians, is the result of continuous exploration by the church of the biblical data, thrashed out in debate and treatises, eventually formulated at the First Council of Nicaea in 325 AD in a way they believe is...

  • History of the Roman Catholic Church
    History of the Roman Catholic Church
    As the oldest branch of Christianity, along with Eastern Orthodoxy, the history of the Catholic Church plays an integral part of the History of Christianity as a whole. This article covers a period of just under 2,000 years....

  • History of the Eastern Orthodox Church
    History of the Eastern Orthodox Church
    The Eastern Orthodox Churches trace their roots back to the Apostles and Jesus Christ. Apostolic succession established the seats of Patriarchy...

  • Christianization
    Christianization
    The historical phenomenon of Christianization is the conversion of individuals to Christianity or the conversion of entire peoples at once...


  • Timeline of Christianity
    Timeline of Christianity
    The purpose of this timeline is to give a detailed account of Christianity from the beginning of the current era to the present. Question marks on dates indicate approximate dates....

  • Roman Catholic Church
    Roman Catholic Church
    The Catholic Church, also known as the Roman Catholic Church, is the world's largest Christian church, with over a billion members. Led by the Pope, it defines its mission as spreading the gospel of Jesus Christ, administering the sacraments and exercising charity...

  • Eastern Orthodox Church
    Eastern Orthodox Church
    The Orthodox Church, officially called the Orthodox Catholic Church and commonly referred to as the Eastern Orthodox Church, is the second largest Christian denomination in the world, with an estimated 300 million adherents mainly in the countries of Belarus, Bulgaria, Cyprus, Georgia, Greece,...

  • Timeline of Christian missions
    Timeline of Christian missions
    This timeline of Christian missions chronicles the global expansion of Christianity through a listing of the most important missionary outreach events.-Apostolic Age:.Earliest dates must all be considered approximate...


>
Centuries of Christian History

External links

The following links give an overview of the history of Christianity:

The following links provide quantitative data related to Christianity and other major religions, including rates of adherence at different points in time:
The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
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