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Rh was probably the eldest, since his brothers yielded to him their claims to the throne. To Pacorus, the elder of his two brothers, Vologases had given Media Atropatene; it was now imperative that a suitable position be found for the younger, Tiridates. Since Armenia, which was felt to be properly Parthian territory, was unsettled, Vologases saw therein an opportunity to strengthen his own position and at the same time provide a satrapy for Tiridates.

Vologases about 52 began an advance into Armenia, where he encountered little resistance. In his rapid advance he took the important city of Tigranocerta and then the capital, Artaxata. Because of the severity of the winter, which had then closed in, and the attendant lack of provisions, Vologases was forced to abandon his conquest. Rhadamistus, who had fled on his approach, at once returned and began to rule with great cruelty, at least according to the reports which reached Rome.

In the meantime the nobles of Adiabene had become dissatisfied with the rule of Izates II and proposed Parthian intervention to Vologases. The Parthian ruler demanded that Izates give up the special privileges granted to him by Artabanus III and resume