Bagasis (also spelled Bakasis, Bagayasha and Vakasis[2]) was a Parthian prince, who played an important role in Parthian politics from 148/7 BC, where he was appointed the governor of the newly conquered region of Media by his brother and king Mithridates I (r. 171–132 BC).[3] Bagasis was initially suggested by the modern historian Gholamreza F. Assar (2005) to have ruled as king briefly in 126 BC,[4] but he later retracted this suggestion (2009).[5] Bagasis was survived by an unnamed son, who occupied high offices under Mithridates II (r. 124–91 BC).[6]