Answer:
The Fourth Crusade's purpose was to recapture the city of Jerusalem that was under the control of the Muslim.
Step-by-step explanation:
Pope Innocent III called the Fourth Crusade to recapture the city of Jerusalem that was under the control of the Muslim. The expedition's purpose was to conquer the Egyptian Ayyubid Sultanate. This Muslim state was considered the most powerful, as well as strongest at that time.
However, some economic and political events led the crusader army sacking the city of Constantinople. The objective was to sack Egypt but instead of that, the crusader army sacked Constantinople's city. It is said that the Fourth Crusade helped solidified the East-West Schism.