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Renewed hostilities after Western Roman coup

In the East, Arcadius died on 1 May 408 and was replaced by his son Theodosius II; Stilicho seems to have planned to march to Constantinople, and to install there a regime loyal to himself. He may also have intended to give Alaric a senior official position and send him against the rebels in Gaul. Before Stilicho could do so, while he was away at Ticinum at the head of a small detachment, a bloody coup against his supporters took place at Honorius's court. It was led by Honorius's minister, Olympius. Stilicho's small escort of Goths and Huns was commanded by a Goth, Sarus, whose Gothic troops massacred the Hun contingent in their sleep, and then withdrew towards the cities in which their own families were billeted. Stilicho ordered that Sarus's Goths should not be admitted, but, now without an army, he was forced to flee for sanctuary. Agents of Olympius promised Stilicho his life, but instead betrayed and killed him.

Alaric was again declared an enemy of the emperor. Olympius's men then massacred the families of the federate troops (as presumed supporters of Stilicho, although they had probably rebelled against him), and the troops defected en masse to Alaric. Many thousands of barbarian auxiliaries, along with their wives and children, joined Alaric in Noricum. The conspirators seem to have let their main army disintegrate and had no policy except hunting down supporters of Stilicho. Italy was left without effective indigenous defence forces thereafter.

As a declared 'enemy of the emperor', Alaric was denied the legitimacy that he needed to collect taxes and hold cities without large garrisons, which he could not afford to detach. He again offered to move his men, this time to Pannonia, in exchange for a modest sum of money and the modest title of Comes, but he was refused because Olympius's regime regarded him as a supporter of Stilicho.