Which crusade was most successful and which was least successful?

The most successful crusade was the First Crusade (1096-1099), which resulted in the capture of Jerusalem and the establishment of several Crusader states in the Levant. The least successful was the Fourth Crusade (1202-1204), which deviated from its original goal of reaching the Holy Land and instead resulted in the sacking of Constantinople, leading to a deepening schism between the Eastern and Western Christian churches.