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Constantinople was founded by the Roman Emperor Constantine I (272–337 AD) in 324[5] on the site of an already-existing city, Byzantium, which was settled in the early days of Greek colonial expansion, around 671–662 BC. The site lay astride the land route from Europe to Asia and the seaway from the Black Sea to the Mediterranean.
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It was the most violent riot in the history of Constantinople, with nearly half the city being burned or destroyed and tens of thousands of people killed.
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Famous in particular for its massive dome, it is considered the epitome of Byzantine architecture and is said to have "changed the history of architecture".
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He had many campaigns and they ended in 559
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In the 600s and 700s, Arab armies overran the wealthy Byzantine provinces of Egypt and Syria before advancing on Constantinople.
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Beginning in 1000, Basil II was free to focus on a war of outright conquest against Bulgaria, a war he prosecuted with grinding persistence and strategic insight.
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a Western European armed expedition originally intended to conquer Muslim-controlled Jerusalem by means of an invasion through Egypt. Instead, a sequence of events culminated in the Crusaders sacking the city of Constantinople, the capital of the Christian-controlled Byzantine Empire.
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It took 53 days overall. The capture led to the end of the Roman Empire.
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The East–West Schism, commonly referred to as the Great Schism of 1054, is the break of communion between what are now the Eastern Orthodox and Catholic Churches, which began in the 11th century and continues.
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The help he sought from the West was simply some mercenary forces, not the immense hosts that arrived, to his consternation and embarrassment, after the pope preached the First Crusade at the Council of Clermont later that same year.