1, The Fourth Crusade did not achieve the conquest of the "Holy Land", but diverted to Constantinople, the capital of Byzantine Empire. It seemed occasional, while implied certain social background.

2, The Fourth Crusade was a disaster of unprecedented dimensions for the Byzantine state.

3, The soldiers of the Fourth Crusade sack Constantinople and kill many fellow Christians.

4, In the Fourth Crusade the Venetians took over Constantinople and established a line of Latin emperors.

5, The originals were stolen from Constantinople's hippodrome, or chariot racing arena, during the Fourth Crusade.