Roman Empire Imperium Romanum 518–602 The Byzantine Empire at its greatest extent since the fall of the Western Roman Empire, under Justinian I in 555 AD. Capital Constantinople Common languages Latin, Greek Government Autocracy Emperor • 518–527 Justin I • 527–565 Justinian I • 565–578 Justin II • 578–582 Tiberius II • 582–602 Maurice • accession of Justin I 10 June 518 • deposition of Maurice 27 November 602 Preceded by Succeeded by Byzantine Empire under the Leonid dynasty Byzantine Empire under the Heraclian dynasty