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The Siege of Damascus (634) lasted from 21 August to 19 September 634 AD b[âº] before the city fell to the Rashidun Caliphate. Damascus was the first major city of the Byzantine (Roman) empire to fall in the Muslim conquest of Syria.
Siege of Constantinople. The Fall of Constantinople occurred after a siege during which the Ottoman Empire, under the command of Sultan Mehmed II, captured the capital of the Byzantine Empire, Constantinople, which was defended by the army of Emperor Constantine XI.