He was the son and successor of Arsames I. Xérxēs (Ξέρξης) is the Greek and Latin (Xerxes, Xerses) transliteration of the Old Iranian Xšaya-ṛšā ("ruling over heroes"), a popular name amongst the rulers of the Persian Achaemenid Empire.

[4] Xerxes succeeded his father as the ruler of Sophene and Commagene in 228 BC, while his brother Orontes IV ruled Armenia.

By 212 BC, Antiochus III had invaded the domain of Xerxes and defeated him after laying siege to the city of Arsamosata.

[6] However, within the same year she arranged to have her new husband assassinated, thinking that her brother would then be able to take control of Sophene.

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