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Pope Leo I

 
Pope Leo I

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Pope Leo I



 
 
Pope Leo I, or Pope Saint Leo the Great, was pope
Pope

The Pope is the Bishop of Rome, the leader of the Roman Catholic Church and head of state of Vatican City. The current pope is Pope Benedict XVI, who was elected April 19, 2005 in Papal conclave, 2005....
 from 29 September, 440
440

Events...
 to 10 November, 461
461

Events...
.

He was an Italian aristocrat, and is the earliest pope of the Roman Catholic Church
Roman Catholic Church

The Roman Catholic Church, officially known as the Catholic Church is the world's largest Christianity Ecclesia , representing over half of all Christians and one-sixth of the world population....
 to have received the title "the Great". He is perhaps best known for having met Attila the Hun
Attila the Hun

Attila , also known as Attila the Hun, was leader of the Huns from 434 until his death in 453. He was leader of the Hunnic Empire which stretched from Germany to the Ural River and from the Danube to the Baltic Sea ....
 outside Rome
Rome

Rome is the capital city of Italy and Lazio, and is Italy's largest and most populous city, with 2,724,347 residents in an urban area of some ....
 in 452, persuading him to turn back. He is also a Doctor of the Church
Doctor of the Church

Doctor of the Church is a title given by a variety of Christian churches to individuals whom they recognize as having been of particular importance, particularly regarding their additions to theological or doctrinal matters....
, and was a leading figure in the centralization of the organization of the Roman Catholic Church.

rding to the Liber Pontificalis
Liber Pontificalis

The Liber Pontificalis is a book of biography of popes from Saint Peter until the 15th century. The original publication of the Liber Pontificalis stopped with Pope Adrian II or Pope Stephen V , but it was later supplemented in a different style until Pope Eugene IV and then Pope Pius II ....
 he was a native of Tuscany
Tuscany

Tuscany is a region in Italy. It has an area of and a population of about 3.6 million inhabitants. The regional capital is Florence.Tuscany is known for its landscapes and its artistic legacy....
.






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Pope Leo I, or Pope Saint Leo the Great, was pope
Pope

The Pope is the Bishop of Rome, the leader of the Roman Catholic Church and head of state of Vatican City. The current pope is Pope Benedict XVI, who was elected April 19, 2005 in Papal conclave, 2005....
 from 29 September, 440
440

Events...
 to 10 November, 461
461

Events...
.

He was an Italian aristocrat, and is the earliest pope of the Roman Catholic Church
Roman Catholic Church

The Roman Catholic Church, officially known as the Catholic Church is the world's largest Christianity Ecclesia , representing over half of all Christians and one-sixth of the world population....
 to have received the title "the Great". He is perhaps best known for having met Attila the Hun
Attila the Hun

Attila , also known as Attila the Hun, was leader of the Huns from 434 until his death in 453. He was leader of the Hunnic Empire which stretched from Germany to the Ural River and from the Danube to the Baltic Sea ....
 outside Rome
Rome

Rome is the capital city of Italy and Lazio, and is Italy's largest and most populous city, with 2,724,347 residents in an urban area of some ....
 in 452, persuading him to turn back. He is also a Doctor of the Church
Doctor of the Church

Doctor of the Church is a title given by a variety of Christian churches to individuals whom they recognize as having been of particular importance, particularly regarding their additions to theological or doctrinal matters....
, and was a leading figure in the centralization of the organization of the Roman Catholic Church.

Early life

According to the Liber Pontificalis
Liber Pontificalis

The Liber Pontificalis is a book of biography of popes from Saint Peter until the 15th century. The original publication of the Liber Pontificalis stopped with Pope Adrian II or Pope Stephen V , but it was later supplemented in a different style until Pope Eugene IV and then Pope Pius II ....
 he was a native of Tuscany
Tuscany

Tuscany is a region in Italy. It has an area of and a population of about 3.6 million inhabitants. The regional capital is Florence.Tuscany is known for its landscapes and its artistic legacy....
. By 431, as a deacon
Deacon

Deacon is a role in the Christianity that is generally associated with service of some kind, but which varies among theological and denominational traditions....
, he occupied a sufficiently important position for Cyril of Alexandria
Cyril of Alexandria

Saint Cyril of Alexandria was the Pope of Alexandria when Alexandria was at its height of influence and power within the Roman Empire. Cyril wrote extensively and was a leading protagonist in the Christological controversies of the later 4th, and 5th centuries....
 to apply to him in order that Rome's influence should be thrown against the claims of Juvenal of Jerusalem
Juvenal of Jerusalem

Saint Juvenal was a bishop of Jerusalem from about 422.Juvenal wanted to make Jerusalem into a primary see by demotion of the metropolitan see of Caesarea Palaestina and the primary see of Antioch....
 to patriarchal jurisdiction over Palestine
Palestine

Palestine is a name which has been widely used since Roman times to refer to the region between the Mediterranean Sea and the Jordan River. It is derived from a name used already much earlier for a narrower geographical region, mainly along the coastal region....
 -- unless this letter is addressed rather to Pope Celestine I
Pope Celestine I

Pope Saint Celestine I was pope from 422 until April 6, 432.Celestine I was a Ancient Rome. Nothing is known of his early history except that his father's name was Priscus....
. About the same time John Cassian
John Cassian

Saint John Cassian , John the Ascetic, or John Cassian the Roman, is a Christian theology celebrated in both the Western and Eastern Churches for his mystical writings....
 dedicated to him the treatise against Nestorius
Nestorius

Nestorius was Patriarch of Constantinople from 10 April 428 to 22 June 431. He was accused by his political enemy Cyril of Alexandria of a heresy that later bore his name, Nestorianism, because he objected to the popular practice of calling the Virgin Mary the "Mother of God" theotokos; he instead preached that "Mother of Christ" would be m...
 written at his request. But nothing shows more plainly the confidence felt in him than his being chosen by the emperor to settle the dispute between Aëtius
Flavius Aëtius

Flavius A?tius or simply A?tius, , dux et patricius, was a Roman Empire general of the closing period of the Western Roman Empire. He was an able military commander and the most influential man of the Western Roman Empire for two decades ....
 and Albinus
Albinus

Albinus might refer to:*Albinus , a Greek philosopher*Albinus , a Roman family name, or cognomen*Alcuin, an English monk*Bernhard Siegfried Albinus, an anatomist...
, the two highest officials in Gaul
Gaul

Gaul is the name used for the region of Western Europe comprising part of present day northern Italy, France, Belgium, western Switzerland and the parts of the Netherlands and Germany on the west bank of the River Rhine....
.

During his absence on this mission, Pope Sixtus III
Pope Sixtus III

Pope Saint Sixtus III was pope from July 31, 432 to August 18, 440.The name of Sixtus is often connected with a great building boom in Rome: Santa Sabina on the Aventine Hill was dedicated during his pontificate and he built Santa Maria Maggiore, whose dedication to Mary, the mother of Jesus the Mother of God reflected his acceptance of the...
 died (August 11, 440
440

Events...
), and Leo was unanimously elected by the people to succeed him. On September 29 he entered upon a pontificate which was to be epoch-making for the centralization of the government of the Roman Church.

Zeal for Chalcedonian Christology

An uncompromising foe of heresy, Leo found that in the diocese of Aquileia
Aquileia

Aquileia is an ancient history Roman Republic city in what is now Italy, at the head of the Adriatic Sea at the edge of the lagoons, about 10 km from the sea, on the river Natiso , the course of which has changed somewhat since Roman times....
, Pelagians
Pelagianism

Pelagianism is a theological theory named after Pelagius . It is the belief that original sin did not taint Instinct and that mortal will is still capable of choosing Goodness and value theory or evil without special Miracle....
 were received into church communion without formal repudiation of their errors; he wrote to rebuke them, making accusations of culpable negligence, and required a solemn abjuration
Abjuration

Abjuration is the solemn repudiation, abandonment, or renunciation by or upon oath, often the renunciation of citizenship or some other right or privilege....
 before a synod
Synod

A synod is a council of a Ecclesia , usually a Christianity church, convened to decide an issue of doctrine, administration or application. An ecumenical council is so named because it is a synod of the whole church ...
.

Manicheans fleeing before the Vandals
Vandals

The Vandals were an East Germanic tribe that entered the late Roman Empire during the 5th century. The Goths Theodoric the Great, king of the Ostrogoths and regent of the Visigoths, was allied by marriage with the Vandals as well as with the Burgundians and the Franks under Clovis I....
 had come to Rome in 439 and secretly organized there; Leo learned of this around 443, and proceeded against them by holding a public debate with their representatives, burning their books, and warning the Roman Christians against them. His efforts led to the edict of Valentinian III
Valentinian III

Flavius Placidus Valentinianus , known in English as Valentinian III, was among the last Western Roman Emperors ....
 against them (June 19, 445
445

Events...
). The edict was a direct insult of the Gallic leader and said in Valentinian's own words, "Nothing should be done to Gaul contrary to its ancient usage."

Nor was his attitude less decided against the Priscillian
Priscillian

Priscillian, bishop of ?vila , a theology from Ancient Rome Gallaecia , was the first person in the history of Christianity to be executed for heresy ....
ists. Bishop Turrubius of Astorga, astonished at the spread of this sect in Spain
Spain

Spain or the Kingdom of Spain , is a country located in Southern Europe on the Iberian Peninsula.The Spanish constitution does not establish any official denomination of the country, even though Espa?a , Estado espa?ol and Naci?n espa?ola are used interchangeably....
, had addressed the other Spanish bishops on the subject, sending a copy of his letter to Leo, who took the opportunity to exercise Roman policy in Spain. He wrote an extended treatise (July 21, 447
447

Events...
), against the sect, examining its false teaching in detail, and calling for a Spanish general council to investigate whether it had any adherents in the episcopate, but this was prevented by the political circumstances of Spain.

In 445, Leo disputed with Pope Dioscorus
Dioscorus of Alexandria

Pope Dioscorus I of Alexandria was the 25th Pope of Alexandria /Patriarch of Alexandria by different traditions respectively.Otherwise known as His Holiness Pope St....
, St. Cyril
Cyril

The name Cyrillus or Cyril or Cyryl is derived from Greek language ???????? , related to kyrios - lord, master.It is the name of several historic figures:...
's successor as Pope of Alexandria, insisting that the ecclesiastical practice of his see should follow that of Rome; since Mark
Mark the Evangelist

Saint Mark the Evangelist , also known as John Mark, is traditionally believed to be the author of the Gospel of Mark and a companion of Saint Peter....
, the disciple of Peter
Saint Peter

Saint Peter was a leader of the early Christianity church, who features prominently in the New Testament Gospels and the Acts of the Apostles....
 and founder of the Alexandrian Church, could have had no other tradition than that of the prince of the apostles. This, of course, was not the position of the Copts, who saw the ancient patriarchates as equals.

The fact that the African province of Mauretania Caesariensis
Mauretania Caesariensis

File:Roman Africa.JPGMauretania Caesariensis was a Roman province located in northwestern Africa. It was the easternmost of the North African Roman provinces, mainly in present Algeria, with its capital at Caesaria , now Cherchell....
 had been preserved to the empire and thus to the Nicene
Nicene Creed

The Nicene Creed is the creed or profession of faith that is most widely used in Christianity liturgy. It is called Nicene because, in its original form, it was adopted in the city of Iznik by the first ecumenical council, which met there in 325....
 faith during the Vandal invasion, and in its isolation was disposed to rest on outside support, gave Leo an opportunity to assert his authority there, which he did decisively in regard to a number of questions of discipline.

In a letter to the bishops of Campania
Campania

Campania is a Regions of Italy of southern Italy in Europe. The region has a population of around 5.8 million people, making it the second-most-populous region of Italy, its total area of 13,595 km? makes it the most densely populated region in the country....
, Picenum
Picenum

Picenum was a region of Ancient Rome Italy. Picenum was the birthplace of such notables as Pompey the Great and his father Pompeius Strabo. It was situated in what is now the region of Marche in modern Italy....
, and Tuscany
Tuscany

Tuscany is a region in Italy. It has an area of and a population of about 3.6 million inhabitants. The regional capital is Florence.Tuscany is known for its landscapes and its artistic legacy....
 (443) he required the observance of all his precepts and those of his predecessors; and he sharply rebuked the bishops of Sicily
Sicily

Sicily is an Autonomous regions with special statute of Italy. Of all the regions of Italy, Sicily covers the largest land area at 25,708 km? and currently has just over five million inhabitants....
 (447) for their deviation from the Roman custom as to the time of baptism
Baptism

In Christianity, baptism is the ritual act, with the use of water, by which one is admitted as a full member of the Christian Church and, in the view of some, as a member of the particular Church in which the baptism is administered....
, requiring them to send delegates to the Roman synod to learn the proper practice.

Because of the earlier line of division between the western and eastern parts of the Roman Empire
Roman Empire

The Roman Empire was the Roman Republic phase of the Ancient Rome, characterised by an autocracy form of government and large territorial holdings in Europe and around the Mediterranean....
, Illyria
Illyria

'Illyria' was in Classical antiquity a region in the western part of today's Balkan Peninsula, inhabited by tribes of Illyrians, an ancient people who spoke the Illyrian languages....
 was ecclesiastically subject to Rome. Pope Innocent I
Pope Innocent I

Pope Saint Innocent I was pope from 401 to March 12, 417.He was, according to his biographer in the Liber Pontificalis, the son of a man called Innocens of Albano; but according to his contemporary Jerome, his father was Pope Anastasius I , whom he was called by the unanimous voice of the clergy and laity to succeed ....
 had constituted the metropolitan
Metropolitan bishop

In Christian churches with episcopal polity, the rank of metropolitan bishop, or simply metropolitan, pertains to the diocesan bishop or archbishop of a metropolis ; that is, the chief city of a historical Roman province, ecclesiastical province, or regional capital....
 of Thessalonica his vicar
Vicar

In the broadest sense, a vicar is a representative, anyone acting "in the person of" or wiktionary:agent for a superior . In this sense, the title is comparable to lieutenant, literally the "place-holder"....
, in order to oppose the growing influence of the patriarch of Constantinople
Patriarch of Constantinople

The Ecumenical Patriarch of Constantinople is the Archbishop of Constantinople ? New Rome ? ranking as primus inter pares in the Eastern Orthodox Church organization, which is seen by followers as the One, Holy, Catholic, and Apostolic Church....
 in the area. In a letter of about 446 to a successor bishop of Thessalonica, Anastasius, Leo reproached him for the way he had treated one of the metropolitan bishops subject to him; after giving various instructions about the functions entrusted to Anastasius and stressing that certain powers were reserved to the pope himself, Leo wrote: "The care of the universal Church should converge towards Peter's one seat, and nothing anywhere should be separated from its Head."

In 451 at the Council of Chalcedon
Council of Chalcedon

The Council of Chalcedon is believed to have been the fourth ecumenical council by the Eastern Orthodox Church and the Roman Catholic Church. It was held from 8 October to 1 November 451 at Chalcedon , today the district of Kadik?y on the Asian side of the Bosphorus, incorporated into the city of Istanbul....
, after Leo's on the two natures of Christ was read out, the bishops participating in the Council cried out: "This is the faith of the fathers ... Peter
Saint Peter

Saint Peter was a leader of the early Christianity church, who features prominently in the New Testament Gospels and the Acts of the Apostles....
 has spoken thus through Leo ..."

Roman Authority in Gaul

Not without serious opposition did he succeed in asserting his authority over Gaul. Patroclus of Arles (d. 426) had received from Pope Zosimus
Zosimus

Zosimus was a Byzantine Empire historian, who lived in Constantinople during the reign of the Byzantine Emperor Anastasius I . According to Photios I of Constantinople, he was a comes, and held the office of "advocate" of the imperial treasury....
 the recognition of a primacy
Primacy

Primacy is the state or condition of being prime or first, as in time, place, rank, etc., hence, excellency; supremacy. It may otherwise refer to a property of the office, rank, or character of a Primate ; the chief ecclesiastical station or dignity in a national church; the office or dignity of an archbishop; as, the primacy of England ...
 over the Gallican Church which was strongly asserted by his successor Hilary
Pope Hilarius

Pope Saint Hilarius was Pope of the Roman Catholic Church from 461 to February 28, 468. He was Canonization as a saint after his death.The Sardinian archdeacon of Rome, Hilarius was elected bishop of Rome probably November 17, 461, and was consecrated November 19, 461 and died on February 28 , 468....
. An appeal from Celidonius of Besançon gave Leo occasion to proceed against Hilary, who defended himself stoutly at Rome, refusing to recognize Leo's judicial status. But Leo restored Celidonius and restricted Hilary to his own diocese, depriving him even of his metropolitan rights over the province of Vienne.

Feeling that his dominant idea of the Roman universal monarchy was threatened, Leo appealed to the civil power for support, and obtained from Valentinian III
Valentinian III

Flavius Placidus Valentinianus , known in English as Valentinian III, was among the last Western Roman Emperors ....
 the famous decree of June 6, 445
445

Events...
, which recognized the primacy of the bishop of Rome based on the merits of Peter, the dignity of the city, and the Nicene Creed
Nicene Creed

The Nicene Creed is the creed or profession of faith that is most widely used in Christianity liturgy. It is called Nicene because, in its original form, it was adopted in the city of Iznik by the first ecumenical council, which met there in 325....
 (in their interpolated form); ordained that any opposition to his rulings, which were to have the force of law, should be treated as treason; and provided for the forcible extradition by provincial governors of anyone who refused to answer a summons to Rome. Hilary made his submission, although under his successor, Ravennius, Leo divided the metropolitan rights between Arles and Vienne (450).

A favorable occasion for extending the authority of Rome in the East was offered in the renewal of the Christological
Christology

Christology is a field of study within Christian theology which is concerned with the nature of Jesus the Christ, particularly with how the divine and human are related in his person....
 controversy by Eutyches
Eutyches

Eutyches was a presbyter and archimandrite at Constantinople. He first came to notice in 431 at the council of Ephesus, for his vehement opposition to the teachings of Nestorius; his condemnation of Nestorianism as heresy precipitated his being denounced as a heretic himself....
, who in the beginning of the conflict appealed to Leo and took refuge with him on his condemnation by Flavian
Flavian

Flavian may refer to:* Any member of the Flavian dynasty of three Roman rulers of the late 1st-century CE* Religious leaders:** Flavian of Ricina , bishop in Italy...
. But on receiving full information from Flavian, Leo took his side decisively.

The Tome

At the Second Council of Ephesus
Second Council of Ephesus

The Second Council of Ephesus was a church synod in 449 AD. It was convoked by Emperor Theodosius II as an Ecumenical council but because of the controversial proceedings it was not accepted as Ecumenical, labelled a Latrocinium and later repudiated at the Council of Chalcedon....
, Leo's representatives delivered his famous Tome (Latin text, a letter), or statement of the faith of the Roman Church in the form of a letter addressed to Flavian
Flavian

Flavian may refer to:* Any member of the Flavian dynasty of three Roman rulers of the late 1st-century CE* Religious leaders:** Flavian of Ricina , bishop in Italy...
, which repeats, in close adherence to Augustine, the formulas of western Christology
Christology

Christology is a field of study within Christian theology which is concerned with the nature of Jesus the Christ, particularly with how the divine and human are related in his person....
, without really touching the problem that was agitating the East. The council did not read the letter, and paid no attention to the protests of Leo's legates, but deposed Flavian and Eusebius, who appealed to Rome.

Leo demanded of the emperor that an ecumenical council should be held in Italy, and in the meantime, at a Roman synod in October, 449, repudiated all the decisions of the "Robber Synod." Without going into a critical examination of its dogmatic decrees, in his letters to the emperor and others he demanded the deposition of Eutyches
Eutyches

Eutyches was a presbyter and archimandrite at Constantinople. He first came to notice in 431 at the council of Ephesus, for his vehement opposition to the teachings of Nestorius; his condemnation of Nestorianism as heresy precipitated his being denounced as a heretic himself....
 as a Manichean and Docetic heretic.

With the death of Theodosius II
Theodosius II

Flavius Theodosius , called the Calligrapher, known in English as Theodosius II, was an Eastern Roman Empire , mostly known for the law code bearing his name, the Codex Theodosianus, and the Walls of Constantinople#The Theodosian Walls of Constantinople built during his reign....
 in 450 and the sudden change in the Eastern situation, Anatolius
Anatolius

Anatolius may refer to:*Patriarch Anatolius of Constantinople -- Patriarch of Constantinople * Anatolius of Laodicea -- Bishop of Laodicea in Syria, also known as Anatolius of Alexandria...
, the new patriarch of Constantinople fulfilled Leo's requirements, and his Tome was everywhere read and recognized.

Leo was now no longer desirous of having a council, especially since it was not to be held in Italy. Instead, it was called to meet at Nicaea, then subsequently transferred to Chalcedon
Chalcedon

Chalcedon was an ancient maritime town of Bithynia, in Anatolia, almost directly opposite Byzantium, south of ?sk?dar . Today, in modern Turkish language, Chalcedon is called Kadik?y, and is a district of Istanbul, Turkey....
, where his legates held at least an honorary presidency, and where the bishops recognized him as the interpreter of the voice of Peter and as the head of their body, requesting of him the confirmation of their decrees. He firmly declined to confirm their disciplinary arrangements, which seemed to allow Constantinople a practically equal authority with Rome and regarded the civil importance of a city as a determining factor in its ecclesiastical position; but he strongly supported its dogmatic decrees, especially when, after the accession of the Emperor Leo I (457) there seemed to be a disposition toward compromise with the Eutychians. He succeeded in having an imperial patriarch, and not the Oriental Orthodox Pope Timotheus Aelurus
Pope Timothy II of Alexandria

Pope Timothy II of Alexandria , also known as ???????/Aelurus , was List of Coptic Popes and twice succeeded in supplanting the Chalcedonian List of Patriarchs of Alexandria....
, chosen as Coptic Orthodox Pope of Alexandria on the murder of Greek Patriarch Proterius of Alexandria
Proterius of Alexandria

Proterius of Alexandria , List of Greek Orthodox Patriarchs of Alexandria , was elected by the Council of Chalcedon in 451 to replace Dioscorus of Alexandria, who had been deposed by the same council ....
.

Leoattila Raphael
The approaching collapse of the Western Empire gave Leo a further opportunity to appear as the representative of lawful authority. When Attila
Attila the Hun

Attila , also known as Attila the Hun, was leader of the Huns from 434 until his death in 453. He was leader of the Hunnic Empire which stretched from Germany to the Ural River and from the Danube to the Baltic Sea ....
 invaded Italy
Italy

Italy , officially the Italian Republic , is a country located on the Italian Peninsula in Southern Europe and on the two largest islands in the Mediterranean Sea, Sicily and Sardinia....
 in 452 and threatened Rome, it was Leo who, with two high civil functionaries, went to meet him, and effected his withdrawal. According to Prosper of Aquitaine
Prosper of Aquitaine

Saint Prosper of Aquitaine , a Christian writer and disciple of Saint Augustine of Hippo, was the first continuator of Jerome's Universal Chronicle....
, he was so impressed by him that he withdrew. Jordanes
Jordanes

Jordanes , was a 6th century Roman bureaucrat , who turned his hand to history later in life.Though he also wrote Romana , a book about the history of Rome, his most known work is his Getica, written in Constantinople about AD 551 ....
, who represents Leo's contemporary Priscus
Priscus

Priscus was from Panium living in the Roman Empire during the 5th century. He was a diplomat, sophist and historian. He accompanied Maximin, the ambassador of Theodosius II, to the court of Attila the Hun in 448....
, gives other grounds. Pragmatic concerns such as the large sum of gold that accompanied Leo, or logistical and strategic concerns, may have been the true reason for Attila's mercy. Attila's army was already quite stretched and full from booty from plunder, the Pope's plea for mercy may well have merely served as an honorable reason to not continuing on and sacking the Roman capitol. Other sources of Catholic hagiographical information cite that an enormously huge man dressed in priestly robes and armed with a flaming sword, visible only to Attila, threatened him and his army with death during his discourse with Pope Leo, and this prompted Attila to submit to the Pope's request. Unfortunately Leo's intercession could not prevent the sack of the city
Sack of Rome (455)

The second of three barbarian Sack of Rome, the sack of 455 was at the hands of the Vandals, then at war with the usurping Western Roman Emperor Petronius Maximus....
 by the Vandals
Vandals

The Vandals were an East Germanic tribe that entered the late Roman Empire during the 5th century. The Goths Theodoric the Great, king of the Ostrogoths and regent of the Visigoths, was allied by marriage with the Vandals as well as with the Burgundians and the Franks under Clovis I....
 in 455, but murder and arson were repressed by his influence. He died probably on November 10, 461
461

Events...
.

Leo's significance

The significance of Leo's pontificate lies in the fact of his assertion of the universal jurisdiction of the Roman bishop, which comes out in his letters, and still more in his ninety-six extant orations. This assertion is commonly referred to as the doctrine of Petrine supremacy.

According to him the Church is built upon Peter, in pursuance of the promise of Matthew 16:16-19. Peter participates in everything which is Christ's; what the other apostles have in common with him they have through him. What is true of Peter is true also of his successors. Every other bishop is charged with the care of his own special flock, the Roman with that of the whole Church. Other bishops are only his assistants in this great task. In Leo's eyes the decrees of the Council of Chalcedon
Council of Chalcedon

The Council of Chalcedon is believed to have been the fourth ecumenical council by the Eastern Orthodox Church and the Roman Catholic Church. It was held from 8 October to 1 November 451 at Chalcedon , today the district of Kadik?y on the Asian side of the Bosphorus, incorporated into the city of Istanbul....
 acquired their validity from his confirmation.

St. Leo's letters and sermons reflect the many aspects of his career and personality, including his great personal influence for good, and are invaluable historical sources. His rhythmic prose style, called cursus leonicus, influenced ecclesiastical language for centuries

The Roman Catholic and many Anglican churches mark November 10 as the feast day of Saint Leo (formerly April 11), while the Eastern Orthodox churches mark February 18 as his feast day.

See also

  • List of 10 longest-reigning popes
    List of 10 longest-reigning popes

    While the term "Pope" is used in several churches to denote their high spiritual leaders, this title in English language usage generally refers to the supreme earthly head of the Roman Catholic Church....