Answer:
Began to decline
Step-by-step explanation:
The Fourth Crusade (1202-1204) begun with the intention of taking the Holy Land, then in Muslim hands, through the conquest of Egypt. However, the crusade was diverted from its original purpose and the Crusaders, together with the Venetians, seized and sacked Constantinople, a Christian capital city of the Byzantine Empire.
Not achieving set goals was one of the reasons that the crusades started losing support.