At this same time, Vannius, whom Drusus Cæsar had made king of the Suevi, was driven from his kingdom. In the commencement of his reign he was renowned and popular with his countrymen; but subsequently, with long possession, he became a tyrant, and the enmity of neighbours joined to intestine strife, was his ruin. Vibillius, king of the Hermunduri, and Vangio and Sido, sons of a sister of Vannius, led the movement. Claudius, though often entreated, declined to interpose by arms in the conflict of the barbar- ians, and simply promised Vannius a safe refuge in the event of his expulsion. He wrote instructions to Publius Atellius Hister, governor of Pannonia, that he was to have his legions, with some picked auxiliaries from the province itself, encamped on the river-bank, as a support to the conquered and a terror to the conqueror, who might otherwise, in the elation of success, disturb also the peace of our empire. For an immense host of Ligii, with other tribes, was advancing, attracted by the fame of the opulent realm which Vannius had enriched during thirty years of plunder and of tribute. Vannius's own native force was infantry, and his cavalry was from the Iazyges of Sarmatia; an army which was no match for his numerous enemy. Consequently, he determined to maintain himself in fortified positions, and protract the war.