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AD 476, the year when Romulus Augustulus, the last Roman emperor of the West, was deposed. But in fact the removal of Romulus was only the final, inevitable step in a process that had begun long before. By 476, the emperor was a puppet without any effective power; the empire had already broken up and was losing one piece after another; barbarians were dominant in Gaul, in Spain, in Africa, and even in Italy; and Rome had been sacked more than once, by the Goths in 410 and again by the Vandals in 455. In short, the dissolution of the empire was already so far advanced that the deposition of the last Western emperor was not very important news. A famous essay by Arnaldo Momigliano titled "An Empire's Silent Fall" demonstrates that the so-called great event of 476, the dethronement of Romulus Augustulus, was noted by few at the time. But if things had reached this point, if the western half of the Roman Empire had been reduced to an empty shell that a barbarian chieftain could sweep aside without eliciting a protest, it was because of a series of traumas that had begun exactly a century before. In 376, an unforeseen flood of refugees at the frontiers of the empire, and the inability of the Roman authorities to manage this emergency properly, gave rise to a dramatic conflict that was to culminate in Rome's most disastrous military defeat since Hannibal's Carthaginians destroyed the Roman army at Cannae in 216 BC.
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Alessandro Barbero (The Day of the Barbarians: The Battle That Led to the Fall of the Roman Empire)