The Fall of Constantinople (Greek: Άλωση της Κωνσταντινούπολης, Alōsē tēs Kōnstantinoupolēs; Turkish: İstanbul'un Fethi Conquest of Istanbul) was the capture of the capital of the Eastern Roman (Byzantine) Empire by an invading army of the Ottoman Empire on Tuesday, 29 May 1453. The Ottomans were commanded by 21-year-old Ottoman Sultan Mehmed II, who defeated an army commanded by Byzantine Emperor Constantine XI Palaiologos.