The Fourth Crusade, which culminated in the sack of Constantinople, was influenced by a complex web of prophecies and political expectations. Crusaders were told that the conquest of Constantinople would fulfill prophecies of Christian unity and the defeat of the Islamic world. Instead, the crusade resulted in the division of Christendom, a disaster that was later interpreted as a punishment for ignoring divine warnings.

The Fourth Crusade and its prophetic justifications have been examined in works by historians and poets, from Dante's Divine Comedy to modern historical novels. It serves as a cautionary tale in literature about the perils of combining prophecy with political ambition, and has been a subject of reflection for poets exploring themes of betrayal and fallen ideals.