In 1204, Christian crusaders marched toward Constantinople instead of Jerusalem—and carried out one of the most infamous sacks in medieval history.

The Fourth Crusade was originally launched to recover the Holy Land. But an impossible contract with Venice, a crushing unpaid debt, and a dangerous offer from a Byzantine prince pulled the expedition toward the capital of the Byzantine Empire.

How did a crusade meant to fight for Jerusalem end with Christians attacking the greatest Christian city in the medieval world?

This documentary follows the complete chain of decisions that led to the Sack of Constantinople in 1204: the crusaders’ agreement with Venice, the attack on the Christian city of Zara, Prince Alexios Angelos and his impossible promises, the restoration and murder of Alexios IV, and the final assault that shattered the Byzantine Empire.

We also examine the role of Venetian Doge Enrico Dandolo, the creation of the Latin Empire, the rise of the Byzantine successor states, and Constantinople’s eventual recovery in 1261.

Most importantly, this video asks whether the Fourth Crusade weakened Byzantium so severely that the Ottoman conquest of Constantinople in 1453 became unavoidable—or whether the empire still had a chance to survive.

This is not simply the story of one siege. It is the story of how debt, political ambition, religious division, and a series of short-term decisions transformed a campaign for Jerusalem into a war against Constantinople.

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