The city of Constantinople (modern Istanbul) was founded by Roman emperor Constantine I in 324 CE and it acted as the capital of the Eastern Roman Empire, or Byzantine Empire as it has later become known, for well over 1,000 years. Although the city suffered many attacks, prolonged sieges, internal rebellions, and even a period of occupation in the 13th century CE by the Fourth Crusaders, its legendary defences were the most formidable in both the ancient and medieval worlds. It could not, though, resist the mighty cannons of the Ottoman Sultan Mehmed II, and Constantinople, jewel and bastion of Christendom, was conquered, smashed, and looted on Tuesday, 29 May 1453 CE.

An Impregnable Fortress

Constantinople had withstood many sieges and attacks over the centuries, notably by the Arabs between 674 and 678 CE and again between 717 and 718 CE. The great Bulgar Khans Krum (r. 802-814 CE) and Symeon (r. 893-927 CE) both attempted to attack the Byzantine capital, as did the Rus (descendants of Vikings based around Kiev) in 860 CE, 941 CE, and 1043 CE, but all failed. Another major siege was instigated by the usurper Thomas the Slav between 821 and 823 CE. All of these attacks were unsuccessful thanks to the city's location by the sea, its naval fleet, and the secret weapon of Greek Fire (a highly inflammable liquid), and, most importantly of all, the protection of the massive Theodosian Walls.

The city's celebrated walls were a triple row of fortifications built during the reign of Theodosius II (408-450 CE) which protected the land side of the peninsula occupied by the city. After 800 years of resisting all comers, the city's defences were finally breached by the knights of the Fourth Crusade in 1204 CE, although the attackers got in through a carelessly left-open door and not because the fortifications themselves had failed in their purpose.

The Ottoman Empire

The Ottoman Empire had begun as a small Turkish emirate founded by Osman in Eskishehir (western Asia Minor) in the late 13th century CE, but by the early 14th century CE, it had already expanded into Thrace. With their capital at Adrianople, further captures included Thessaloniki and Serbia. In 1396 CE, at Nikopolis on the Danube, an Ottoman army defeated a Crusader army.

Another Crusader army was defeated in 1444 CE at Varna near the Black Sea coast. Then the new Sultan, Mehmed II (r. 1451-1481 CE), after extensive preparations such as building, extending, and occupying fortresses along the Bosporus, notably at Rumeli Hisar and Anadolu in 1452 CE, moved to finally sweep away the Byzantines and their capital.

The Defenders

The crushing of the Crusader army at Varna in 1444 CE meant that the Byzantines were now on their own. No significant help could be expected from the West where the Popes were already unimpressed with the Byzantine's unwillingness to form a union of the Church and accept their supremacy. The Byzantines were hopelessly outnumbered in men, ships, and weapons.

There were also ominous tales of impending doom: prophesies that proclaimed the fall of Constantinople when the emperor was called Constantine and there was an eclipse of the moon - which there was in the days before the siege of 1453 CE.

The Attackers

Mehmed II had one thing that previous besiegers of Constantinople had lacked: cannons. These fearsome weapons were put to good use in November 1452 CE when a Venetian ship, disobeying a ban on traffic, was blown out of the water as it sailed down the Bosphorus.

The Ottoman army numbered 200,000 men, but modern historians prefer a more realistic figure of 60-80,000. When the army assembled at the city walls of Constantinople on 2 April 1453 CE, the Byzantines got their first glimpse of Mehmed's cannons. The largest was 9 metres long with a gaping mouth one metre across. Already tested, it could fire a ball weighing 500 kilos over 1.5 km. So mammoth was this cannon that it took an awfully long time to load and cool it so that it could only be fired seven times a day. Still, the Ottomans had plenty of smaller cannon, each capable of firing over 100 times a day.

On 5 April, Mehmed sent a demand for immediate surrender to the Byzantine emperor but received no reply. On 6 April the attack began. The Theodosian Walls were relentlessly blasted, chunk by chunk, into rubble. The resulting rubble piles actually absorbed the cannon shot better than fixed walls but, eventually, one of the infantry assaults would surely get through.

A Fight For Survival

The onslaught went on for six weeks but there was some effective resistance. The Ottoman attack on the boom which blocked the city's harbour was repelled, as were several direct assaults on the Land Walls. On 20 April, miraculously, three Genoese ships sent by the Pope and a ship carrying vital grain sent by Alphonso of Aragon managed to break through the Ottoman naval blockade and reach the defenders. Mehmed, infuriated, then got around the harbour boom by building a railed road via which 70 of his ships, loaded onto carts pulled by oxen, could be launched into the waters of the Golden Horn. The defenders now struggled to station men where they were needed, especially along the structurally weaker sea walls.

Back in Asia Minor, Mehmed faced several revolts as his subjects became unruly while their Sultan and his army were abroad. For this reason, Mehmed offered Constantine a deal: pay tribute and he would withdraw. The emperor refused, and Mehmed gave the news to his men that now, when the city fell, as surely it would, they could plunder whatever they wished from one of the richest cities in the world.

Mehmed launched a massive go-for-broke, throw-everything-at-them assault at dawn on 29 May. First to be sent in after the usual cannon barrage were the second-rate troops, then a second wave was launched with better-armed troops, and, finally, a third wave attacked the walls, this time composed of the Janissaries - the well-trained and highly determined elite of Mehmed's army.

Some fool had left the small Kerkoporta gate in the Land Walls open and the Janissaries did not hesitate in using it. They climbed to the top of the wall and raised the Ottoman flag, then they worked their way around to the main gate and allowed their comrades to flood into the city.

Destruction

Chaos now ensued with some of the defenders maintaining their discipline and meeting the enemy while others rushed back to their homes to defend their own families. The emperor could have fled the city days before but he chose to stay with his people.

Many of the city's inhabitants committed suicide rather than be subject to the horrors of capture and slavery. Perhaps 4,000 were killed outright, and over 50,000 were shipped off as slaves. Many sought refuge in churches and barricaded themselves in, including inside the Hagia Sophia, but these were obvious targets for their treasures, and after they were looted for their gems and precious metals, the buildings and their priceless icons were smashed, the cowering captives butchered.

In the afternoon, Mehmed entered the city himself, called an end to the pillaging and declared that the Hagia Sophia church be immediately converted into a mosque. It was a powerful statement that the city's role as a bastion of Christianity for twelve centuries was now over. Mehmed then rounded up the most important survivors from the city's nobility and executed them.

Aftermath

Constantinople was made the new Ottoman capital, the massive Golden Gate of the Theodosian Walls was made part of the castle treasury of Mehmed, while the Christian community was permitted to survive, guided by the bishop Gennadeios II. What was left of the old Byzantine empire was absorbed into Ottoman territory following the conquest of Mistra in 1460 CE and Trebizond in 1461 CE. Meanwhile, Mehmed, aged only 21 and now known as "the Conqueror", settled in for a long reign and another 28 years as Sultan.

Byzantine culture would survive, especially in the arts and architecture, but the fall of Constantinople was, nevertheless, a momentous episode of world history, the end of the old Roman Empire and the last surviving link between the medieval and ancient worlds.

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