History of Europe
In 395 Theodosius I, who had made Christianity the official religion of the Roman Empire, would be the last emperor to preside over a united Roman Empire. The empire was split into two halves: the Western Roman Empire centred in Ravenna, and the Eastern Roman Empire (later to be referred to as the Byzantine Empire) centred in Constantinople. The Roman Empire was repeatedly attacked by Hunnic, Germanic, Slavic and other “barbarian” tribes (see: Migration Period), and in 476 finally the Western part fell to the Heruli chieftain Odoacer.
Majorian
A prominent general of the Late Roman army, Majorian deposed Emperor Avitus in 457 and succeeded him. Majorian was the last emperor to make a concerted effort to restore the Western Roman Empire with its own forces. Possessing little more than Italy, Dalmatia, and some territory in northern Gaul, Majorian campaigned rigorously for three years against the Empire's enemies. His successors until the fall of the Empire, in 476/480, were actually instruments of their barbarian generals, or emperors chosen and controlled by the Eastern Roman court.