List of sieges of Constantinople

Originally known as Byzantium in classical antiquity, the first recorded siege of the city occurred in 510 BC by the Achaemenid Empire under the command of Otanes.

It later became known as Constantinople, and in the years that followed it came under attack by both Byzantine pretenders fighting for the throne and also by foreign powers for a total of 22 times.

Out of the ten sieges that occurred during its time as a city-state and while it was under Roman rule, six were successful, three were repelled and one was lifted as a result of the agreement between the parties.

Of all the sieges that took place from its founding by Constantine the Great till 1453, only three were successful, 21 were unsuccessful, and three were lifted by reaching mutual agreements.

The Sack of Constantinople that took place in 1204 during the Fourth Crusade caused the city to fall and to be established as the capital of the Latin Empire.