The Byzantine empire was the Roman empire, merely its eastern counterpart.
The island is Corsica.
The Eastern Empire.
Constantine gained complete control of the Roman empire in either 314 or 316. Sources differ on the year.
The Roman empire was in power when Jesus was crucified.
The last Roman who was meant to have control over Britain was Honorius , the last emperor of the western part of the Roman Empire. However, he lost control when Constantine III was proclaimed emperor by the Roman soldiers in Britain, took the remaining Roman troops on the island to Gaul and established himself as usurper emperor of Gaul and Britain.
The Byzantine Empire was actually the part of the Roman Empire that Emperor Constantine still had control of - so technically it came after the Roman Empire
The mass movement of peoples from Eurasia into the Empire overwhelmed the Roman ability to retain control.
success and control
The Roman Empire had extended its control over Western Europe
Mongols
It's control of the peoples within it and secure border control.