

The city's fall also stood as a turning point in military history. The conquest of Constantinople and the fall of the Byzantine Empire was a watershed of the Late Middle Ages and is considered the end of the medieval period.

The capture of Constantinople, a city which marked the divide between Europe and Asia Minor, also allowed the Ottomans more effectively to invade mainland Europe, eventually leading to Ottoman control of much of the Balkan peninsula. The fall of Constantinople marked the end of the Byzantine Empire and the end of the Roman Empire, a state which dated back to 27 BC and lasted nearly 1,500 years. After conquering the city, Mehmed II made Constantinople the new Ottoman capital, replacing Adrianople. The attacking Ottoman Army, which significantly outnumbered Constantinople's defenders, was commanded by the 21-year-old Sultan Mehmed II (later called "Mehmed the Conqueror"), while the Byzantine army was led by Emperor Constantine XI Palaiologos. The city fell on, the culmination of a 53-day siege which had begun on 6 April 1453. The fall of Constantinople ( Byzantine Greek: Ἅλωσις τῆς Κωνσταντινουπόλεως, romanized: Hálōsis tē̂s Kōnstantīnoupóleōs Turkish: İstanbul'un Fethi, lit.'Conquest of Istanbul') was the capture of the capital of the Byzantine Empire by the Ottoman Empire.
