The siege and sack of Constantinople occurred in April 1204 and marked the culmination of the Fourth Crusade. Mutinous Crusader armies captured, looted, and destroyed parts of Constantinople, the capital of the Byzantine Empire. After the capture of the city, the Latin Empire (known to the Byzantines as the Frankokratia or the Latin Occupation)[5] was established and Baldwin of Flanders was crowned Emperor Baldwin I of Constantinople in the Hagia Sophia.