Roman Empire Βασιλεία Ῥωμαίων 1185–1204 The Byzantine Empire on the eve of the Fourth Crusade, in 1203 AD. Capital Constantinople Common languages Greek Religion Eastern Orthodox Church Government Autocracy Emperor • 1185–1195; 1203–1204 Isaac II Angelus • 1195–1203 Alexios III • 1203–1204 Alexios IV • 1204 Alexios V • 1204 Constantine Laskaris History • Deposition of Andronikos I 1185 • Fall of Constantinople to the Fourth Crusade 1204 Preceded by Succeeded by Byzantine Empire under the Komnenos dynasty Latin Empire Empire of Nicaea Empire of Trebizond Despotate of Epirus Kingdom of Thessalonica