<P> The Fall of Constantinople ( Greek : Ἅλωσις τῆς Κωνσταντινουπόλεως , Halōsis tēs Kōnstantinoupoleōs ; Turkish : İstanbul'un Fethi Conquest of Istanbul ) was the capture of the capital of the Byzantine Empire by an invading army of the Ottoman Empire on 29 May 1453 . The Ottomans were commanded by the then 21 - year - old Ottoman Sultan Mehmed the Conqueror , who defeated an army commanded by Byzantine Emperor Constantine XI Palaiologos . The conquest of Constantinople followed a 53 - day siege that had begun on 6 April 1453 . </P>
<P> The Fall of Constantinople ( Greek : Ἅλωσις τῆς Κωνσταντινουπόλεως , Halōsis tēs Kōnstantinoupoleōs ; Turkish : İstanbul'un Fethi Conquest of Istanbul ) was the capture of the capital of the Byzantine Empire by an invading army of the Ottoman Empire on 29 May 1453 . The Ottomans were commanded by the then 21 - year - old Ottoman Sultan Mehmed the Conqueror , who defeated an army commanded by Byzantine Emperor Constantine XI Palaiologos . The conquest of Constantinople followed a 53 - day siege that had begun on 6 April 1453 . </P>
under whose leadership were the ottomans finally able to capture constantinople
under whose leadership were the ottomans finally able to capture constantinople
Sultan Mehmed the Conqueror
Sultan Mehmed the Conqueror