Definition of Roman Empire in US English:

Roman Empire

proper noun

  • The empire established by Augustus in 27 BC and divided by Theodosius in AD 395 into the Western or Latin and Eastern or Greek Empire.

Rome was sacked by the Visigoths under Alaric in 410, and the last emperor of the West, Romulus Augustulus, was deposed in 476. The Eastern Empire, whose capital was Constantinople, lasted until 1453 (see Byzantine Empire)