Drachm - Phraates II

Phraates II inherited the Parthian throne from his father Mithridates I around 138 BC and spent much of his reign managing the catastrophic pressure of Seleucid attempts to reclaim lost territory. Antiochus VII Sidetes invaded with a large force and initially succeeded in reoccupying significant ground, before Phraates turned the campaign decisively in 129 BC — Antiochus died in battle, his army destroyed. The victory secured Parthian control over Mesopotamia permanently.

Phraates himself was killed around 127 BC fighting Saka nomads along the eastern frontier, ironically using captured Greek soldiers from Antiochus's defeated army as auxiliaries — troops who reportedly switched sides mid-battle.