Crusader armies diverted from their intended destination of Jerusalem instead sacked Constantinople, the Byzantine capital, looting treasures and establishing Latin rule over Greek territories. This catastrophe weakened Byzantine imperial authority, disrupted trade routes, and increased tax burdens on remaining Greek populations as fragmented successor states competed for resources.

The fall of Constantinople inspired lament poetry in Greek and other languages, with writers mourning the destruction of Christian unity and classical heritage. Byzantine poets composed elegies for their fallen city that influenced later Greek literature's treatment of loss and exile, while Western chroniclers' accounts shaped European perceptions of the East in medieval romance and epic poetry.