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[[File: Constantinople 2.jpg|300px250px|thumb|left| The reconstructed walls of Constantinople]]The Arab siege of Constantinople in 717-718, (commonly known as the second Arab siege) is regarded as one of the most important battles in European history. This was the most determined effort by the Caliphs to conquer the Byzantine Empire. Emperor Leo III managed to defeat the besieging Muslims Muslim army and navy. This had the following important consequences it battle saved the successor state to the Roman Empire and allowed it was to continue in one form or for another for over 600 years. It ended the Arab campaign to conquer the Byzantines and helped to undermine the Umayyad Caliphate. Moreover, the Byzantine victory prevented the Muslims from entering Eastern Europe, therefore preventing the Islamization of the region. Finally, the siege also indirectly led to a religious revolution known as Iconoclasm.

====Background====The followers of Muhammad had invaded the Byzantine Empire in the mid-seventh century. The Muslims defeated the army of the Christian Emperor at the Battle of Homs. After this victory, the Arabs conquered the Byzantine territories in the Near East and North Africa. A Muslim navy and army besieged Constantinople between 674-678 in alliance with the Avars but were ultimately defeated.<ref> Treadgold, Warren T. <i>[https://www.amazon.com/gp/product/0804726302/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0804726302&linkCode=as2&tag=dailyh0c-20&linkId=82b3332950b0a9c88f488ff1ac4c672a A History of the Byzantine State and Society]</i> (Stanford, Stanford University Press, 1997), p 16</ref> There then followed several decades of an uneasy peace, between the two superpowers. However, by 700 AD , the Umayyad Caliphs were at the peak of their power and ruled an Empire empire from Spain to Central Asia. They began large-scale incursions into the Byzantine heartland and also conquered the Christian allies of the Empire in the Caucuses.

By the early years of the 8th century, the Umayyad Caliph was preparing for the final destruction of the Christian Empire. Constantinople was the key, and the Arabs knew that they had to capture the city if they were to conquer the successor of Rome.<ref>Treadgold, p. 87</ref> Byzantine had been severely weekend weakened by a series of civil wars , and its eastern defenses were crumbling. The Arabs launched a combined land and sea invasion in 716 AD. They followed a coastal route and by-passed bypassed many Christian strongholds. To ease the conquest, they encouraged one of the governors in Anatolia to revolt and claim claimed the throne. The reigning Byzantine Emperor abdicated rather than plunge the Empire into another civil war. The rebel governor became Emperor Leo III and is popularly known as Leo the Isaurian. He had agreed with the Arabs that if he became Emperor that he would become the vassal of the Umayyad Caliphif he became Emperor. Leo III did not keep his end of the bargain and was determined to keep Byzantine independent and Christian. Enraged the , Caliph Umar II ordered his massive army and navy to the vast walls of Constantinople.

====The Siege of Why was Constantinople==attacked?==

In Autumn 717 , the Caliph Umar II ordered his brother Masalama to besiege Constantinople. He led an army of 80,000 and a fleet of some two hundred ships, mostly oared galleys.<ref> Davis, Paul K. "Constantinople: August 717–15 August 718" <i>[https://www.amazon.com/gp/product/0195143663/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0195143663&linkCode=as2&tag=dailyh0c-20&linkId=af9472455d3cb5895f9d3b9f349c6f4a 100 Decisive Battles: From Ancient Times to the Present]</i> (Oxford, United Kingdom: Oxford University Press, 2001). pp. 99–102</ref> The Caliph personally directed the attack from Damascus. Leo III was an experienced soldier , and he had strengthened the walls of the city and had stockpiled supplies. He ordered any civilian who did not have three years supply of food to leave the city. The Byzantine navy was able to keep the Bosporus open despite the continued efforts of the Arab fleet to blockade the waterway and cut off the city from the Black Sea. The Christian navy had a secret weapon, and this was ‘Greek Fire.’ <ref> Davis, p. 100</ref> This was a flammable liquid that could be directed upon the enemy with devastating effects. The Byzantines similarly used Greek Fire in a similar manner to a modern flamethrower.

This weapon allowed the Christian ships to destroy many Arab galleys. The Byzantines received regular supplies by sea, but the Arabs suffered great hardship, especially in winter. The Caliph sent reinforcements from Egypt. Despite many assaults, the Arabs could not breach the walls of Constantinople. Leo III then entered an alliance with the Bulgars, a Turkish people who had established a powerful kingdom on the borders of Byzantium.<ref>Davis, p. 101</ref> They agreed to attack the Arab forces besieging the capital of the Christian Empire, in return for payments of gold. In the summer of 718 AD, the Bulgars attacked the Arabs and destroyed a 5000-strong foraging party. The Umayyad forces were almost trapped between the walls of Constantinople and the Bulgars. The Caliph ordered a retreat from Constantinople but during this, the Bulgar Khan's forces massacred some 30,000 Muslim soldiers before they could board the ships. The Byzantine navy pursued the Muslim navy and destroyed many galleys, many more Muslim ships were lost in a storm.<ref>Davis, p. 101</ref>

====Byzantium and In the Arabs: Balance summer of Power====[[File: Siege of Con three.jpg|350px|thumb|left|A manuscript showing Greek Fire being used against Arab ships]]The siege was a complete victory for Leo III and 718 AD, the Christian Empire. Moreover, he had saved Bulgars attacked the Byzantine EmpireArabs and destroyed a 5000-strong foraging party. He had displayed extraordinary leadership and had inspired the defenders to resist the repeated assaults on The Umayyad forces were almost trapped between the walls of Constantinople and the cityBulgars. He and his navy and army were heavily outnumbered by the ArabsThe Caliph ordered a retreat from Constantinople, but Leothe Bulgar Khan's tactics kept forces massacred some 30,000 Muslim soldiers before they could board the Muslims at bay for two yearsships. If the Umayyad forces had been able to capture the city known as the New Rome the The Byzantine Empire would have almost certainly collapsed. Constantinople was navy pursued the focal point of the EmpireMuslim navy and destroyed many galleys. The bureaucracy Many more Muslim ships were lost in the city helped to keep the very diverse Empire together. While the metropolis was at a centre of the extensive trade network that bound the Empire togetherstorm. Moreover<ref>Davis, the city was the military and naval stronghold of the sprawling Byzantine realms, if Constantinople had fallen the Empire would have been left defencelessp. 101</ref>

The defeat of ==Byzantium and the Arabs outside the walls : Balance of ‘New Rome’ saved the Empire, from almost certain destruction. Indeed, such was the enormity Power==[[File: Siege of the defeat suffered by the Muslims that they never again attempted to conquer ConstantinopleCon three.<ref> Treadwell, p. 167</ref> jpg|250px|thumb|left|A manuscript showing Greek Fire being used against Arab ships]]The heirs of Umar II siege was a complete victory for Leo III and the later Abbasid dynasty never seriously considered another siege of the great Christian metropolisEmpire. The Arabs continued to raid Christian territory but no longer posed an existential to ByzantiumMoreover, he had saved the Byzantine Empire. These raids concentrated on securing booty rather than territory. The Umayyad army was weakened in the aftermath of the siege He had displayed extraordinary leadership and Leo III began to retake territories that had been lost inspired the defenders to resist the repeated assaults on the Muslimscity's walls. The Muslim fleet had been destroyed at Constantinople He and it never recovered his navy and the Byzantine regained their old supremacy at sea. The defeat of army were heavily outnumbered by the Arabs in 718 A.D can be seen as , but Leo's tactics kept the beginning of a new era Muslims at bay for the Christian Empire which saw it expand its territory, economy and cultural and religious influence.<ref> Treadwell, ptwo years. 145</ref>

====The future of Europe====[[File:Siege of con four.jpg|200px|thumb|left| A coin with If the Umayyad forces had captured the city known as the New Rome, the portrait of Leo III]]The Byzantine Empire would have almost certainly collapsed. Constantinople was to resist Muslim attacks until it's fall in 1453. It has been described as the bulwark focal point of Europe by many historiansthe Empire. If the Arabs had succeeded The bureaucracy in capturing the city, they could have conquered helped to keep the Christian very diverse Empire and used it as the gateway into Europetogether. At this the same time Eastern Europe was largely tribal and pagan, but the Byzantine Church metropolis was slowly spreading its influence, especially in at the center of the Slav and extensive trade network that bound the Bulgar realmsEmpire together. EventuallyMoreover, the Byzantines secured the conversion of the peoples of city was the Balkans and later Russia. The Orthodox churches in Eastern Europe military and Russia are the ‘daughter churches’ naval stronghold of the sprawling Byzantine Churchrealms.<ref>MeyendorffIf Constantinople had fallen, John. <i>[https://www.amazon.com/gp/product/0913836907/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0913836907&linkCode=as2&tag=dailyh0c-20&linkId=54b9a005dc6c444f0ade105baf1f1862 The Byzantine Legacy in the Orthodox Church]</i> (Yonkers: St Vladimir's Seminary Press, 1982), p. 19</ref> Moreover, through the influence of the Greek Orthodox Church, the culture of Constantinople was transmitted throughout Eastern Europe and Russia. This is evident in the Cyrillic Alphabet and in the art of Eastern Europe in later centuriesEmpire would have been left defenseless.

However, if The defeat of the Arabs had been able to capture Constantinople this would outside the walls of ‘New Rome’ saved the Empire from almost certainly not have occurredcertain destruction. InsteadIndeed, such was the enormity of the defeat suffered by the Caliphs armies would have eventually conquered many European territories and as in their other conquests, Muslims that they would have spread their Muslim faith and Arab culture. It seems likely that Russia would also have embraced Islam. If the Arab army had captured never again attempted to conquer Constantinople much of Eastern Europe and possibly Russia could have become part of the Muslim world.<ref>MeyendorffTreadwell, p. 134167</ref> The victory heirs of Leo III prevented the Muslims from entering the Balkans for many centuries Umar II and when the Ottomans did, they found that Christianity was entrenched, so much so, that almost five centuries later Abbasid dynasty never seriously considered another siege of Muslim rule did not lead to the region, becoming Islamizedgreat Christian metropolis. For this reason, the defeat of the Arab siege was as significant as the Battles of Tours and Marathon in the history of EuropeThe Arabs continued to raid Christian territory but no longer posed an existential to Byzantium.

====Decline of the These raids concentrated on securing booty rather than territory. The Umayyad Dynasty====It has often been stated that the Umayyad dynasty went into decline army was weakened after the unsuccessful siege of Constantinople, and Leo III began to retake territories lost to the Muslims. There is no doubt that the Caliphs The Muslim fleet had been severely weakened on land destroyed at Constantinople, and it never recovered, and the Byzantine regained their old supremacy at sea. The defeat came at a difficult time for the dynasty as the Empire was also suffering from fiscal challenges. The balance of power after the siege shifted towards the ByzantineArabs in 718 A. The Umayyad dynasty was so concerned in D can be seen as the wake beginning of a new era for the defeat that the considered abandoning their recent conquests in IberiaChristian Empire, which saw it expand its territory, economy, and cultural and religious influence. The decline of the Caliphs was underlined at the Battle of Akroinon in 740 when once again Leo III defeated a large Arab force when he annihilated some 20<ref> Treadwell,000 soldiersp. 145</ref>

==The blow to Umayyad prestige was significant and many zealous Muslims claimed that future of Europe==[[File:Siege of con four.jpg|250px|thumb|left| A coin with the defeats were because portrait of Leo III]]The Byzantine Empire was resisted Muslim attacks until its fall in 1453. It has been described as the impiety bulwark of Europe by many historians. If the Caliphs. This culminated Arabs had succeeded in a series of revolts that ultimately led to capturing the Abbasid Revolution when city, they could have conquered the Umayyads were deposed Christian Empire and almost used it as the entire family massacredgateway into Europe. The defeat of Eastern Europe was largely tribal and pagan, but the Umayyads before Byzantine Church was slowly spreading its influence, especially in the walls of Constantinople helped to undermine Slav and the dynastyBulgar realms. HoweverEventually, they Caliphs had also been weakened by a series the Byzantines secured the conversion of the peoples of defeats in central Asia the Balkans and in the Caucuseslater Russia. It cannot be denied that the failure of Umar II to take Constantinople was a factor The Orthodox churches in the decline Eastern Europe and Russia are the fall ‘daughter churches of the second CaliphateByzantine Church.<ref>HawtingMeyendorff, G.RJohn. <i>[https://www.amazon.com/gp/product/04152407350913836907/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=04152407350913836907&linkCode=as2&tag=dailyh0c-20&linkId=06d75c26844fff0201735e07b03465a7 54b9a005dc6c444f0ade105baf1f1862 The First Dynasty of Islam: The Umayyad Caliphate, AD 661–750Byzantine Legacy in the Orthodox Church]</i> (London, RutledgeYonkers: St Vladimir's Seminary Press, 20001982), p. 20119</ref>Moreover, through the influence of the Greek Orthodox Church, the culture of Constantinople was transmitted throughout Eastern Europe and Russia. This is evident in the Cyrillic Alphabet and the art of Eastern Europe in later centuries.

====Leo III and Iconoclasm====The Emperor after his victory against the Muslims was viewed as the saviour of the Christian world and his reign began a long and often successful fightback against the Arabs. Leo established a very successful dynasty, the Isaurian (717-802). He used his popularity to reform the bureaucracy, the tax system and reclaimed Sicily from a usurper. Leo was from the eastern part of the Empire, that bordered Arab territories, which was influenced by Islamic theology, especially with regard to its prohibition on representations of the divine image, because it was idolotrous.<ref> Haldon, John F. <i>[https://www.amazon.com/gp/product/052131917X/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=052131917X&linkCode=as2&tag=dailyh0cdh-20&linkId=6842a4ec7c5dd1b5d90fa5f0351fa77b Byzantium in the Seventh Century: The Transformation of a Culture]</i> (Cambridge, Cambridge University Press, 1990),p. 56<ad/ref> Many, including Leo, from the east, came to believe that the worship of religious icons, in particular, was idolatry and it was argued by the iconoclasts that this had led to God almost abandoning the Christian Empire.

The victory over However, if the Arabs in 718 Ahad captured Constantinople, this would almost certainly not have occurred.D was also a victory for Instead, the Iconoclast partyCaliph's armies would have eventually conquered many European territories, and as in their other conquests, they would have spread their Muslim faith and Arab culture. The Isaurian Emperor believed It seems likely that his victory was a sign that God favoured IconoclasmRussia would also have embraced Islam. In 730 AD he prohibited If the use Arab army had captured Constantinople, much of icons Eastern Europe and their production, claiming they were idolatrouspossibly Russia could have become part of the Muslim world.<ref> HaldonMeyendorff, p. 15134</ref> This divided the Empire as Greek speakers were in favour The victory of icons while Christians in Leo III prevented the East supported iconoclasm. Those who defied Muslims from entering the decree on icons were persecutedBalkans for many centuries, often brutally. It also led to and when the destruction of many priceless works of artOttomans did, especially icons and statues and Byzantine culture they found that Christianity was entrenched, so much impoverished by Leo’s religious intoleranceso that almost five centuries of Muslim rule did not lead to the region, becoming Islamized. Iconoclasm For this reason, the defeat of the Arab siege was to destabilize as significant as the Empire until Battles of Tours and Marathon in the mid-9th century, when iconoclasm was finally defeatedhistory of Europe.

==Decline of the Umayyad Dynasty==ConclusionIt has often been stated that the Umayyad dynasty went into decline after the unsuccessful siege of Constantinople. There is no doubt that the Caliphs had been severely weakened on land and sea. The balance of power after the siege shifted towards the Byzantine. The Umayyad dynasty was so concerned about the defeat that they considered abandoning their recent conquests in Iberia. The decline of the Caliphs was underlined at the Battle of Akroinon in 740 when once again, Leo III defeated a large Arab force when he annihilated some 20,000 soldiers. The defeat came at a difficult time for the dynasty as the Empire was also suffering from fiscal challenges.  The blow to Umayyad prestige was significant, and many zealous Muslims claimed that the defeats were because of the impiety of the Caliphs. This culminated in a series of revolts that ultimately led to the Abbasid Revolution when the Umayyads were deposed, and almost the entire family massacred. The defeat of the Umayyads before the walls of Constantinople helped to undermine the dynasty. However, the Caliphs were also weakened by a series of defeats in central Asia and the Caucuses. It cannot be denied that the failure of Umar II to take Constantinople was a factor in the decline and the fall of the second Caliphate.<ref>Hawting, G.R. <i>[https://www.amazon.com/gp/product/0415240735/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0415240735&linkCode=as2&tag=dailyh0c-20&linkId=06d75c26844fff0201735e07b03465a7 The First Dynasty of Islam: The Umayyad Caliphate, AD 661–750]</i> (London, Rutledge, 2000), p. 201</ref> ==Leo III and Iconoclasm==After his victory against the Muslims, the Emperor was viewed as the savior of the Christian world, and his reign began a long and often successful fightback against the Arabs. Leo established a successful dynasty, the Isaurian (717-802). He used his popularity to reform the bureaucracy, the tax system and reclaimed Sicily from a usurper. Leo was from the eastern part of the Empire, which bordered Arab territories, influenced by Islamic theology, especially concerning its prohibition on representations of the divine image because it was idolatrous.<ref> Haldon, John F. <i>[https://www.amazon.com/gp/product/052131917X/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=052131917X&linkCode=as2&tag=dailyh0c-20&linkId=6842a4ec7c5dd1b5d90fa5f0351fa77b Byzantium in the Seventh Century: The Transformation of a Culture]</i> (Cambridge, Cambridge University Press, 1990),p. 56</ref> Many, including Leo, from the east, came to believe that the worship of religious icons, in particular, was idolatry and it was argued by the iconoclasts that this had led to God almost abandoning the Christian Empire.  The victory over the Arabs in 718 A.D was also a victory for the Iconoclast party. The Isaurian Emperor believed that his victory was a sign that God favored Iconoclasm. In 730 AD, he prohibited the use of icons and their production, claiming they were idolatrous.<ref> Haldon, p. 15</ref> This divided the Empire as Greek speakers favored icons while Christians in the East supported iconoclasm. Those who defied the decree on icons were persecuted, often brutally. It also led to the destruction of many priceless works of art, especially icons and statues, and Byzantine culture was much impoverished by Leo’s religious intolerance. Iconoclasm was to destabilize the Empire until the mid-9th century when iconoclasm was finally defeated. ==Conclusion==The failure of Umar II to capture the Christian metropolis of Constantinople was of immense historical significance. The siege weakened the Umayyad dynasty in Damascus and contributed to their demise. Because the Christian Emperor was able to withstand the Muslim army , the future of the Byzantine Empire was secure, and it even expanded and was to survive until the 15th century. The defeat of the Umayyad’s Umayyads also prevented the expansion of Islam into Eastern Europe at a time when the Slavs and other peoples could have been susceptible to the influence of Islam. Because Leo III had defeated the Muslims , he kept them out of Eastern Europe for several hundred years and this . This allowed the region to become Orthodox Christian in faith and culture. The siege weakened the Umayyad dynasty in Damascus and contributed to their demise. Finally, Leo III interpreted his victory as divine approval for the doctrine of Iconoclasm, which convulsed the Empire for over a century. ====Suggested Readings====* Kaldelis, Anthony, [https://www.amazon.com/gp/product/0190625945/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0190625945&linkCode=as2&tag=dailyh0c-20&linkId=8b8e1285dfa849ad5f453fa35d1f89f6 A Cabinet of Byzantine Curiosities: Strange Tale of Surprising Facts from History's Most Orthodox Empire] (Oxford University Press, 2017)* Hawting, G.R. <i>[https://www.amazon.com/gp/product/0415240735/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0415240735&linkCode=as2&tag=dailyh0c-20&linkId=06d75c26844fff0201735e07b03465a7 The First Dynasty of Islam: The Umayyad Caliphate, AD 661–750]</i> (London, Rutledge, 2000)* Haldon, John F. <i>[https://www.amazon.com/gp/product/052131917X/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=052131917X&linkCode=as2&tag=dailyh0c-20&linkId=6842a4ec7c5dd1b5d90fa5f0351fa77b Byzantium in the Seventh Century: The Transformation of a Culture]</i> (Cambridge, Cambridge University Press, 1990)* Meyendorff, John. <i>[https://www.amazon.com/gp/product/0913836907/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0913836907&linkCode=as2&tag=dailyh0c-20&linkId=54b9a005dc6c444f0ade105baf1f1862 The Byzantine Legacy in the Orthodox Church]</i> (Yonkers: St Vladimir's Seminary Press, 1982)* Davis, Paul K. "Constantinople: August 717–15 August 718" <i>[https://www.amazon.com/gp/product/0195143663/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0195143663&linkCode=as2&tag=dailyh0c-20&linkId=af9472455d3cb5895f9d3b9f349c6f4a 100 Decisive Battles: From Ancient Times to the Present]</i> (Oxford, United Kingdom: Oxford University Press, 2001)