After spending much of his life in Roman exile, he accompanied the emperor Trajan on the latter's campaign to conquer Parthia. Trajan originally planned to annex Ctesiphon as part of the Roman Empire, but ultimately decided instead to place Parthamaspates on his father's throne as a Roman client, doing so in 116. Trajan effectively crowned Parthamaspates as a king of Parthia. (source Wikipedia)
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The reverse depicts the investiture of Parthamaspates as king of Parthia in AD 116.
