The siege and capture of the city by sultan Mehmet the Conqueror, in 1453. That also meant the end of the Byzantine Empire itself.
The First Crusade, sometimes referred to as the Siege of Jerusalem, started in 1095 and ended in 1099. Crusader armies from Italy and France broke into separate groups and marched toward Constantinople.
No single incident did that, apart of course from the siege and fall of the city of Constantinople itself. Over the preceding centuries, Byzantium already had lost practically all of its eastern lands, including Turkey proper and also had lost its Balkan properties. Basically, it had become little more than a city-State consisting of the city of Constantinople, parts of Greece and a few scraps of land outside the city. For many decades it had already been a client State of the Ottoman Empire, paying a large yearly tribute to the Sultan just to be left in peace. Large parts of Constantinople had become uninhabited and little to nothing was left of its former richness. But Sultan Suleyman considered the taking of the city essential for the success of any plans to expand his territories and influence westward into the Balkan region, which would require full control of the Bosporus waterway that he then needed to cross and that Constantinople now controlled.
Constantinople was given the titles of "the new, second New Rome," "Alma Roma", "Eastern Rome" and "Roma Constantinopolitana."
Constantinople
The book 1453, Constantinople The Last Great Siege was written by Roger Crowley. It is a non-fiction book telling the story of the siege of the great city of Constantinople by the Ottoman Turks in the year 1453.
240 days
5 Days
The Byzantines defeated the Arabs and the second siege of Constantinople ended.
The siege of Leningrad lasted 871 days from 8th september 1941- 27th January 1944.
1123 years :)
From May 19 until July 4, 1863
6 months June to Decemberr 1266
An example of a technological development utilized by Sultan Mehmed II in his siege of Constantinople was Orban's cannon (the Basillica). This was a piece of artillery that was capable of shooting a cannonball up to 1 mile.
It was renamed Istanbul (meaning 'to the city') in 1930.
Six days.
Greek fire