It is often assumed that the fall of the Western Roman Empire, and therefore the transition from Classic Antiquity to the Middle Age, coincided with the deposition of the last emperor, Romulus Augustus, in AD 476 by the Gothic chief Odoacer. However, the deposition of Romulus Augustus (476) should not be seen as a landmark event, but rather as a chronological benchmark that was conventionally established by later commentators to schematize complex historical events. The fact of the matter is that contemporary chroniclers took little notice of the fate of Romulus Augustus. In a seminal article, Arnaldo Momigliano referred to it as “the noiseless fall of an empire”. Chroniclers and lay-people alike had been far more traumatized by the Roman defeat at Adrianople (near today’s Istanbul) in AD 378 in the East – the worst since Cannae, when Hannibal seriously threatened to overrun Rome – or by the Sack of Rome, in 410, in the West. By the late fifth century AD, Barbarians had built their kingdoms within the imperial borders, most emperors were figureheads, and the imperial institutions had already crumbled. Instead of a “fall”, it would thus be more appropriate to speak of a steady decline, with episodic recoveries, which began with the successor of Hadrian (AD 117-138). The next emperor, the celebrated Marcus Aurelius (163-180), had to confront the first wave of invasions from the North, which were barely contained in Northern Italy, while a catastrophic epidemic of plague visited the empire, and the traditional eastern enemy, the Parthians, took advantage of the Roman weakness to launch a large-scale offensive campaign in the Middle East. The killing of his despotic and capricious son, emperor Commodus, in 193, marked the beginning of a long period of instability for the empire, which was ruled by very few capable men, who were, in the main, usurpers. Most of the emperors died a violent death and the legions of Gaul time and again rebelled against Rome and arrogated to themselves the right to proclaim the new emperors, while various remote provinces gained increased autonomy and sought to become independent. It was only in AD 284 that Diocletian, a former slave from Illyria, restored the order by enacting a series of important administrative, economic and military reforms. But when he died, in 305, several aspirants to the throne set off a civil war that lasted for almost two decades, until Constantine “the Great”, in 323, managed to defeat all his opponents. He moved the capital to Byzantium (now Istanbul, in Turkey), which was rechristened Constantinople – so that the empire’s centre of gravity shifted from West to East –, took on the functions and prerogatives of an Oriental despot, reformed the army, and authorized the Christian cult, personally attending the Council of Nicea, in 325, which established the principles and dogmas of Christian orthodoxy. He died in 337, and another civil war for his succession was brought to an end in 353 by his son Constant II. Meanwhile, the pressure on the eastern and northern frontiers was mounting, as the cohesion of the empire weakened. In AD 378, the entire Eastern Roman Army was destroyed at Adrianople by the Goths, and emperor Valens fell on the battlefield. His successor, Theodosius, was the last great emperor to rule over the whole of the empire. Upon his death, which occurred in 395, the empire was definitively split into the Western and the Eastern empires, governed by Theodosius’s heirs Honorius and Arcadius.