The Fall of Constantinople, also known as the Conquest of Constantinople, was the capture of the capital of the Byzantine Empire by the Ottoman Empire. The city fell on 29 May 1453 as part of the culmination of a 53-day siege which had begun on 6 April. The city's collapse marked the end of the Middle Ages. The attacking Ottoman Army, which significantly outnumbered Constantinople's defenders, was commanded by the 21-year-old Sultan Mehmed II, while the Byzantine army was led by Emperor Constantine XI Palaiologos. After conquering the city, Mehmed II made Constantinople the new Ottoman capital, replacing Adrianople. The conquest of Constantinople and the fall of the Byzantine Empire was a watershed of the Late Middle Ages, marking the effective end of the last remains of the Roman Empire, a state which began in roughly 27 BC and had lasted nearly 1500 years. Among many modern historians, the Fall of Constantinople is considered the end of the medieval period.
The fall was significant on the history of Europe, from the attitude, to the culture of the different nation states.
Now, how would the world change if the Ottomans were repelled and Constantinople, and by extension, the Byzantine Empire didn't collapse when they did in 1453.
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