Final answer:
During the Fourth Crusade, Constantinople was attacked and sacked by crusaders, leading to its occupation until its recapture by the Byzantines in 1261.
Explanation:
Constantinople was attacked by crusaders in the Fourth Crusade, despite being a Christian city. The crusaders, angered by not receiving promised rewards and enticed by the city's riches, seized Constantinople in 1204 and occupied it until 1261 when it was reclaimed by the Byzantines.
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