Final answer:
The Fourth Crusade was a military campaign in the 13th century that aimed to capture Jerusalem but ended up attacking Constantinople.
Step-by-step explanation:
The Fourth Crusade was a military campaign that took place in the early 13th century. It was launched by the Catholic Church with the objective of recapturing the holy city of Jerusalem from the Muslims. However, the crusaders ended up diverting their route and attacking the Christian city of Constantinople instead, resulting in the sack and looting of the city.
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