Siege of Constantinople (718)
Encyclopedia
The Second Arab Siege of Constantinople (717–718) was a combined land and sea effort by the Arabs to take the capital city of 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...

, 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:...

. The Arab ground forces, led by Maslamah ibn Abd al-Malik
Maslamah ibn Abd al-Malik
Maslamah ibn Abd al-Malik was an Umayyad prince and one of the most prominent Arab generals of the early decades of the 8th century, leading several campaigns against the Byzantine Empire and the Khazar Khaganate...

, were held off by the massive city walls
Walls of Constantinople
The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople since its founding as the capital of the Eastern Roman Empire by Constantine the Great...

, decimated by an outbreak of plague and finally destroyed by the Bulgarian army
Medieval Bulgarian Army
The medieval Bulgarian army was the primary military body of the First and the Second Bulgarian Empires. During the first decades after the foundation of the country, the army consisted of a Bulgar cavalry and a Slavic infantry. The core of the Bulgarian army was the heavy cavalry, which consisted...

. The Arab naval fleet was defeated by Greek fire
Greek fire
Greek fire was an incendiary weapon used by the Byzantine Empire. The Byzantines typically used it in naval battles to great effect as it could continue burning while floating on water....

 and its remnants sank in a storm on their return voyage.

Initial stages

After the First Arab siege of Constantinople (674-678) the Arabs attempted a second decisive attack on the city. An 80,000-strong army led by Maslama, the brother of Caliph
Caliph
The Caliph is the head of state in a Caliphate, and the title for the ruler of the Islamic Ummah, an Islamic community ruled by the Shari'ah. It is a transcribed version of the Arabic word   which means "successor" or "representative"...

 Sulayman ibn Abd al-Malik
Sulayman ibn Abd al-Malik
Sulayman bin Abd al-Malik was an Umayyad caliph who ruled from 715 until 717. His father was Abd al-Malik ibn Marwan, and he was a younger brother of the previous caliph, al-Walid I.-Early years:...

, crossed the Bosporus
Bosporus
The Bosphorus or Bosporus , also known as the Istanbul Strait , is a strait that forms part of the boundary between Europe and Asia. It is one of the Turkish Straits, along with the Dardanelles...

 from Anatolia
Anatolia
Anatolia is a geographic and historical term denoting the westernmost protrusion of Asia, comprising the majority of the Republic of Turkey...

 to besiege Constantinople by land, while a massive fleet of Arab war galleys commanded by another Suleiman, estimated to initially number 1,800 ships, sailed into the Sea of Marmara
Sea of Marmara
The Sea of Marmara , also known as the Sea of Marmora or the Marmara Sea, and in the context of classical antiquity as the Propontis , is the inland sea that connects the Black Sea to the Aegean Sea, thus separating Turkey's Asian and European parts. The Bosphorus strait connects it to the Black...

 to the south of the city. Emperor Leo III
Leo III the Isaurian
Leo III the Isaurian or the Syrian , was Byzantine emperor from 717 until his death in 741...

 was able to use the famed Walls of Constantinople
Walls of Constantinople
The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople since its founding as the capital of the Eastern Roman Empire by Constantine the Great...

 to his advantage and the Arab army was unable to breach them, whilst the Arab galleys were unable to sail up the Bosporus as they were under constant attack and harassment by the Byzantine navy
Byzantine navy
The Byzantine navy was the naval force of the East Roman or Byzantine Empire. Like the empire it served, it was a direct continuation from its imperial Roman predecessor, but played a far greater role in the defense and survival of the state then its earlier iterations...

, who used Greek fire
Greek fire
Greek fire was an incendiary weapon used by the Byzantine Empire. The Byzantines typically used it in naval battles to great effect as it could continue burning while floating on water....

 to great effect.

Winter and spring

Norwich describes the 717/718 winter as "the cruelest winter that anyone could remember." Constantinople was supplied via the Black Sea
Black Sea
The Black Sea is bounded by Europe, Anatolia and the Caucasus and is ultimately connected to the Atlantic Ocean via the Mediterranean and the Aegean seas and various straits. The Bosphorus strait connects it to the Sea of Marmara, and the strait of the Dardanelles connects that sea to the Aegean...

 and did not suffer much hardship, in contrast to the Arab besiegers on land, who suffered immense hardship and losses due to disease
Disease
A disease is an abnormal condition affecting the body of an organism. It is often construed to be a medical condition associated with specific symptoms and signs. It may be caused by external factors, such as infectious disease, or it may be caused by internal dysfunctions, such as autoimmune...

 and starvation
Starvation
Starvation is a severe deficiency in caloric energy, nutrient and vitamin intake. It is the most extreme form of malnutrition. In humans, prolonged starvation can cause permanent organ damage and eventually, death...

 during the winter, as they were not able to supply adequate provisions and were forced to eat their camels, horses, donkeys and according to a Greek source even small rocks and the bodies of their dead. The ground was frozen and the Arabs were forced to throw hundreds of their dead into the sea of Marmara, including the Arab naval commander, Admiral Sulieman. An Egypt
Egypt
Egypt , officially the Arab Republic of Egypt, Arabic: , is a country mainly in North Africa, with the Sinai Peninsula forming a land bridge in Southwest Asia. Egypt is thus a transcontinental country, and a major power in Africa, the Mediterranean Basin, the Middle East and the Muslim world...

ian fleet of 400 ships and an Africa
Africa
Africa is the world's second largest and second most populous continent, after Asia. At about 30.2 million km² including adjacent islands, it covers 6% of the Earth's total surface area and 20.4% of the total land area...

n fleet of 360 ships arrived in the spring with fresh reinforcements, but successive assaults on the city were unable to cause a breach in its defenses. Many of the sailors who manned the Arab fleets were recently enslaved
Islam and Slavery
Islamic views on slavery first developed out of the slavery practices of pre-Islamic Arabia. During the wars between different states/tribes in various parts of the world, prisoners/captives were either killed or enslaved...

 or dhimmi
Dhimmi
A , is a non-Muslim subject of a state governed in accordance with sharia law. Linguistically, the word means "one whose responsibility has been taken". This has to be understood in the context of the definition of state in Islam...

 Christians who also deserted en masse.

Death of a Caliph

Caliph Suleiman had perished in 717 whilst fighting the Byzantines on the border, most likely trying to lead a relief force or a diversionary attack, and was replaced by Umar II
Umar II
Umar ibn Abd al-Aziz was an Umayyad caliph who ruled from 717 to 720. He was also a cousin of the former caliph, being the son of Abd al-Malik's younger brother, Abd al-Aziz. He was also a great-grandson of the companion of the Prophet Muhammad, Umar bin Al-Khattab.-Lineage:Umar was born around...

, who continued the siege. No doubt the death and succession of the Caliph in 717 played a role in delaying reinforcements until spring. Michael of Syria claims that "Maslama lied to them, as he was saying that soon reinforcements from their king would arrive." but it is very likely that Maslama, to the best of his knowledge, was telling the truth and was unaware that his brother, the Caliph Suleiman, had died while leading such a force against the Byzantine border.

Bulgarian aid

The Bulgars
Bulgars
The Bulgars were a semi-nomadic who flourished in the Pontic Steppe and the Volga basin in the 7th century.The Bulgars emerge after the collapse of the Hunnic Empire in the 5th century....

, who had established friendlier relations with the Byzantines a year earlier under Khan Tervel
Tervel of Bulgaria
Khan Tervel also called Tarvel, or Terval, or Terbelis in some Byzantine sources, was the Emperor of the Bulgarians at the beginning of the 8th century. In 705 he received the title Caesar which was a precedent in history. He was probably a Christian like his grandfather Khan Kubrat...

, ostensibly because of the looming Arab threat, came to the aid of the besieged city in the fall of 717. Norwich states "The Bulgars had no love for the Byzantines, but they preferred them to the infidel and were in any case determined that, if Constantinople were to be taken, it should fall into Bulgar rather than Arab hands." The Arabs were surprised by the new and unexpected enemy and his attack on their own camp, followed by a horrible massacre. Encouraged by this, the Byzantines opened the gates and attempted to break the siege, but were stopped at the Arab trenches and had to retreat back behind the city walls because of the following Arab counter-attack. This scene was repeated several times during the siege with the same ill success for both sides. The incessant Bulgar attacks in the rear of the Arabs forced them to build trenches also against the Bulgars. This way, however, the Arabs found themselves in a thin line between two fortifications, which were attacked both by Bulgars and Byzantines. After an unusually harsh winter, weary from the long attrition of siege warfare, thinned out by disease and hunger, and demoralized by the lack of success in assaulting the city, the Arabs attempted to retreat to their ships in July, but were devastated by a Bulgar attack against their land forces. Contemporary chroniclers report that at least 22,000-32,000 Arabs died in the first Bulgarian attack.

Arab retreat

Unable to continue the siege in the face of the Bulgarian onslaught and lack of successes, the Arabs were forced to abandon their ambitions on Constantinople in August. Part of the Arab army attempted to withdraw back through Anatolia while the rest attempted to withdraw by sea in the remaining Arab vessels. A devastating storm wrecked the Arab fleet on its way back, destroying all but five galleys and drowning the men who had retreated by sea.

Historical significance

This battle was a severe blow to Caliph Umar II
Umar II
Umar ibn Abd al-Aziz was an Umayyad caliph who ruled from 717 to 720. He was also a cousin of the former caliph, being the son of Abd al-Malik's younger brother, Abd al-Aziz. He was also a great-grandson of the companion of the Prophet Muhammad, Umar bin Al-Khattab.-Lineage:Umar was born around...

 and the expansion of the Umayyad Caliphate was severely stunted during his reign. The outcome was of macrohistorical importance since 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:...

 was central to 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...

, which according to Judith Herrin
Judith Herrin
Judith Herrin is Emeritus Professor of Late Antique and Byzantine Studies at King's College London. She studied history at the University of Cambridge and did her PhD at the University of Birmingham. She trained in Paris and Munich, worked as an archaeologist with the and on the site of...

 continued to serve as a bulwark against Islamic expansion into Europe. Many contemporary Arab and Western historians look at the Second Arab siege of Constantinople in the same light that modern Western historians look at the Battle of Tours
Battle of Tours
The Battle of Tours , also called the Battle of Poitiers and in Battle of the Court of the Martyrs, was fought in an area between the cities of Poitiers and Tours, located in north-central France, near the village of Moussais-la-Bataille, about northeast of Poitiers...

, as a pivotal event in history that turned back the tide of Muslim incursions into Europe, ensuring 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...

 would be the dominant religion in Europe at a time when Europe was in a state of disarray following the Decline of the Roman Empire
Decline of the Roman Empire
The decline of the Roman Empire refers to the gradual societal collapse of the Western Roman Empire. Many theories of causality prevail, but most concern the disintegration of political, economic, military, and other social institutions, in tandem with foreign invasions and usurpers from within the...

. Leo III would go on to consolidate Byzantium's borders and defeat the Umayyad Caliphate again at the Battle of Akroinon
Battle of Akroinon
The Battle of Akroinon was fought at Akroinon or Akroinos in Phrygia, on the western edge of the Anatolian plateau, in 740 between an Umayyad Arab army and the Byzantine forces. The Arabs had been conducting regular raids into Anatolia for the past century, and the 740 expedition was the largest...

. Bulgarian aid to the city was one of the key factors for the defeat of the Arabs and many poets and musicians glorified Khan Tervel as "The saviour of Europe". Blankinship argues that, along with the Battle of Toulouse
Battle of Toulouse (721)
The Battle of Toulouse was a victory of an Aquitanian army led by Duke Odo of Aquitaine over an Umayyad army besieging the city of Toulouse, and led by the governor of Al-Andalus, Al-Samh ibn Malik al-Khawlani...

 and the Battle of Tours, the failure of the siege of Constantinople caused the Umayyad dynasty's weakness to be shown and was a primary factor in the fall of that Caliphate.

As Paul K. Davis writes, "By turning back the Moslem invasion, Europe remained in Christian hands, and no serious Moslem threat to Europe existed until the fifteenth century. This victory, coincident with the Frankish victory at Tours (732), limited Islam’s western expansion to the southern Mediterranean world."

Contemporary sources

As the Syriac Chronicle of Michael the Syrian
Michael the Syrian
Michael the Syrian , also known as Michael the Great or Michael Syrus or Michael the Elder, to distinguish him from his nephew, was a patriarch of the Syriac Orthodox Church from 1166 to 1199. He is best known today as the author of the largest medieval Chronicle, which he composed in Syriac...

 records:

Aftermath

The Arab forces now turned to raiding Byzantine territory in annual expeditions (razzias), while the frontier stabilized along the Taurus
Taurus Mountains
Taurus Mountains are a mountain complex in southern Turkey, dividing the Mediterranean coastal region of southern Turkey from the central Anatolian Plateau. The system extends along a curve from Lake Eğirdir in the west to the upper reaches of the Euphrates and Tigris rivers in the east...

-Antitaurus
Anti-Taurus Mountains
Anti-Taurus is a mountain range in southern and eastern Turkey, curving northeast from the Taurus Mountains. The tallest mountain in the range is Mount Erciyes,...

 range. The Byzantines remained on the defensive and suffered a series of losses, most notably the sack of Amorium
Sack of Amorium
The Sack of Amorium by the Abbasid Caliphate in mid-August 838 was one of the major events in the long history of the Byzantine–Arab Wars. The Abbasid campaign was led personally by the Caliph al-Mu'tasim , in retaliation to a virtually unopposed expedition launched by the Byzantine emperor...

 in 838 and of Thessalonica in 904, or the gradual loss of Sicily
Sicily
Sicily is a region of Italy, and is the largest island in the Mediterranean Sea. Along with the surrounding minor islands, it constitutes an autonomous region of Italy, the Regione Autonoma Siciliana Sicily has a rich and unique culture, especially with regard to the arts, music, literature,...

 and later of Crete
Crete
Crete is the largest and most populous of the Greek islands, the fifth largest island in the Mediterranean Sea, and one of the thirteen administrative regions of Greece. It forms a significant part of the economy and cultural heritage of Greece while retaining its own local cultural traits...

, where a piratical emirate
Emirate of Crete
The Emirate of Crete was a Muslim state that existed on the Mediterranean island of Crete from the late 820s to the Byzantine reconquest of the island in 961....

 was founded. Byzantium however would regain her strength. Byzantine armies destroyed the Arab presence in Asia Minor in the late 9th and early 10th centuries, and conquered much of Syria and northern Mesopotamia in the period 930-980. Until the arrival of the Seljuk Turks in the mid-11th century, the balance of power in the Middle East had shifted in Byzantium's favor.
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