Arsaces II of Parthia
Arsaces II succeeded his father Arsaces I in 217 BC. In 209 BC, the energetic Seleucid king Antiochus III the Great recaptured Parthia, which had been previously seized from the Seleucids by Arsaces I and the Parni around 247 BC. Arsaces II sued for peace following his defeat on the battlefield at Mount Labus. Prior to this, Antiochus had already occupied the Parthian capital at Hecatompylos, pushing forward to Tagae near Damghan. Following the defeat of Arsaces II at Mount Labus, Antiochus turned westwards into Hyrcania where he occupied Tambrax. The heavily barricaded city of Syrinx was then taken by siege.
In the terms of the peace, Arsaces accepted feudatory status and from then onwards ruled Parthia and Hyrcani as a vassal state of the Seleucids. Antiochus in turn withdrew his troops westwards, where he would subsequently be embroiled in wars with Rome and so would leave the fledgling Parthian kingdom to its own devices. Arsaces II was succeeded by his relative Phriapatius in 191 BC.