Kingdom of Thessalonica
However, after Constantinople was conquered during the Fourth Crusade in 1204, Greece was divided among the Crusaders. The Latin Empire held Constantinople and Thrace, while Greece itself was divided into the Kingdom of Thessalonica, the Principality of Achaea, and the Duchy of Athens. The Venetians controlled the Duchy of the Archipelago in the Aegean, while the Despotate of Epirus was established as one of the three Byzantine Greek successor states.