The history of the Byzantine Empire covers the history of the eastern Mediterranean empire from late antiquity until the Fall of Constantinople in 1453 AD. Several events from the 4th to 6th centuries mark the transitional period during which the Roman Empire's east and west divided. In 285, the emperor Diocletian (r. 284-305) partitioned the Roman Empire's administration into eastern and western halves. Between 324 and 330, Constantine I (r. 306-337)...