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.
Roman triumph
For triumphs of the Roman regal era, the surviving Imperial "Fasti Triumphales" are incomplete. After three entries for the city's legendary founder Romulus, eleven lines of the list are missing. Next in sequence are Ancus Marcius, Tarquinius Priscus, Servius Tullius, and finally Tarquin "the proud", the last king. The "Fasti" were compiled some five centuries after the regal era, and probably represent an approved, official version of several different historical traditions. Likewise, the earliest surviving written histories of the regal era, written some centuries after it, attempt to reconcile various traditions, or else debate their merits. Dionysus, for example, gives Romulus three triumphs, the same number given in the "Fasti". Livy gives him none, and credits him instead with the first spolia opima, in which the arms and armour were stripped off a defeated foe, then dedicated to Jupiter. Plutarch gives him one, complete with chariot. Tarquin has two triumphs in the "Fasti" but none in Dionysius. No ancient source gives a triumph to Romulus' successor, the peaceful king Numa.