Arsacēs is the Latin form of the Greek Arsákēs (Ἀρσάκης), itself from Parthian Aršak (𐭀𐭓𐭔𐭊).

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.

[1] 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.