Roman Empire Βασιλεία Ῥωμαίων Imperium Romanum 610–711 The Byzantine Empire by the end of the wars with Sassanid Persia, during Heraclius' reign. The striped areas experienced Sassanid raids. Capital Constantinople Common languages Latin (ceremonial and local), Greek Government Autocracy Emperor • 610–641 Heraclius • February–May 641 Constantine III, Heracleonas • May–September 641 Heracleonas • 642–668 Constans II • 668–685 Constantine IV • 685–695; 705–711 Justinian II Historical era Early Middle Ages • accession of Heraclius October 5 610 • deposition of Justinian II December 711 Preceded by Succeeded by Byzantine Empire under the Justinian dynasty Twenty Years' Anarchy