The Crusades contributed to the fall of the Byzantine empire when in 1203 AD the Crusaders with their fourth crusade under the Roman Catholic struck Constantinople, destroying the city, which made the then Emperor run away.
In the same vein, the Crusaders changed the name of the Byzantine empire and limited their control to Constantinople alone. This incident diminished the power of the Byzantine Empire, and it was finally conquered by the Ottoman Turk in 1453.
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