At its greatest extent Roman rule or influence extended from Armenia and Mesopotamia in the east to the Iberian peninsula in the west, and from the Rhine and Danube in the north to Egypt and provinces on the Mediterranean coast of North Africa. The empire was divided after the death of Theodosius I (ad 395) into the Western Empire and the Eastern or Byzantine Empire (centred on Constantinople). Peace was maintained largely by the substantial presence of the Roman army, and a degree of unity was achieved by an extensive network of roads, a single legal system, and a common language (Latin in the West, Greek in the East). 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, which was stronger, lasted until 1453 (see Byzantine Empire)