Artashata is first attested during the Cadusian expedition of Artaxerxes III () in the 350s BC. During a battle, Artashata distinguished himself by slaying a warrior in single combat. His exploit was noticed by Artaxerxes III, who sent him gifts and gave him the Satrapy of Armenia. It was probably after this promotion that Artashata married for the first time, to an unknown noblewoman, who bore him two daughters, and possibly a son named Ariobarzanes. His first marriage has suggested being the "terminus ad quem" for when he dropped his Aramaic name, Codomannus. Greek writers report that Artashata later became the "courier" and "slave" of the king, which some modern historians believe was written to belittle Artashata. However, the terms are in reality a Greek translation of the Old Persian "bandaka", which did not mean slave, but "henchman, (loyal) servant, vassal."