The Ottoman Turks won in 1453.
It was the end of the Roman Empire in the East. By that time the Empire had changed it's name to the Byzantine Empire, but it had a continuous history that goes back to the founding of Rome in 753 BC.
The Crusaders won in 1210, but the Byzantines managed to regain the city a few years later.
Before that the Arabs besieged Constantinople several times and so did the Persians, Russ, Bulgars and Slavs. Each previous time the Byzantine Empire managed to beat off their attackers.
The Ottoman Empire
The Ottoman Turks
The ottoman empire in 1453.
Constantinople
Constantinople
Constantinople
Istanbul
Constantinople
Istanbul
Constantinople
The Byzantines defeated the Arabs and the second siege of Constantinople ended.
Constantinople
Constantinople
Constantinople
The KIevan Rus' attacked Constantinople and the Bosphorus.