Roman Empire Βασιλεία Ῥωμαίων 820–867 The Byzantine Empire in 842 AD. Capital Constantinople Common languages Greek Government Autocracy Emperor • 820–829 Michael II • 829–842 Theophilos • 842–867 Michael III History • accession of Michael II 820 • death of Michael III 867 Preceded by Succeeded by Byzantine Empire under the Nikephorian dynasty Byzantine Empire under the Macedonian dynasty