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Setting the scene
By 1204, the Fourth Crusade had been diverted from its original goal of conquering Egypt. The crusaders, led by Venetian Doge Enrico Dandolo, had agreed to transport by Venice but couldn't pay. Dandolo diverted them to attack Zara (a Christian city) in 1202, for which they were excommunicated. Then Alexios Angelos, son of deposed Byzantine emperor Isaac II, offered the crusaders 200,000 silver marks and military aid for the Holy Land if they restored his father to the throne in Constantinople.
What happened
In 1203, the crusaders attacked Constantinople, restored Isaac II and Alexios IV, but the Byzantines couldn't pay the promised sum. In January 1204, Alexios IV was murdered in a coup. The crusaders, now broke and angry, decided to attack Constantinople itself. On April 12, 1204, they breached the walls and sacked the city for three days. They looted churches, including Hagia Sophia, raped nuns, and destroyed priceless art and manuscripts. The crusaders established the Latin Empire of Constantinople, with Baldwin of Flanders as emperor.
Why it still matters
The Fourth Crusade's sack of Constantinople was a catastrophe for Christendom—it permanently crippled the Byzantine Empire, which never recovered, making it vulnerable to Ottoman conquest in 1453. The sack deepened the East-West Schism and ensured Byzantines would never trust Western Catholics again. The crusaders looted vast treasures—including the four bronze horses now in Venice's St. Mark's Basilica. The Fourth Crusade demonstrated how crusading idealism could be corrupted by commercial and political interests (especially Venice's). It is remembered as the ultimate betrayal of crusading ideals—Christians sacking the greatest Christian city. The event accelerated Byzantine decline and reshaped the Mediterranean world.
Background
The sack severely weakened Byzantium long before 1453. Even centuries later, this episode remains a reference point for how empires rise, fracture, and transform.