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.
Persecution of pagans in the late Roman Empire
In 476, the last western emperor, Romulus Augustulus, was deposed by Odoacer, who became the first "barbarian" king of Italy. Pagans used the occasion to attempt to revive the old rites. In 484, the Magister militum per Orientem, Illus, revolted against Eastern Emperor Zeno and raised his own candidate, Leontius, to the throne. Leontius hoped to reopen the temples and restore the ancient ceremonies; as such, many Pagans joined in his revolt against Zeno. Illus and Leontius were compelled, however, to flee to a remote Isaurian fortress, where Zeno besieged them for four years. Zeno finally captured them in 488 and promptly had them executed. Following the revolt, Zeno instituted harsh anti-paganism policies. With the failure of the revolt of Leontios, some pagans became disillusioned and became Christian, or pretended to do so, in order to avoid persecution. The subjugation of the Roman Empire to Christianity became complete when the emperor Anastasius I, who came to the throne in 491, was required to sign a written declaration of orthodoxy before his coronation.