Zariadres (Ζαριάδρης) is the Greek rendering of an Iranian name, attested as zrytr/zryhr in the Aramaic inscriptions of Artaxias I in Sevan and Siwnik, and as Zareh in Armenian sources.
[4] Strabo writes that Sophene was taken over by a "general [strategos]" of King Antiochus III (r. 222–187 BC) called Zariadres.
[7] Different views exist on the question of whether the Zareh mentioned in Artaxias I's Aramaic inscriptions is identical with the Zariadres who became ruler of Sophene according to Strabo.
Michał Marciak argues that identifying Zariadres of Sophene with the Zareh of the inscriptions seems to be "the most straightforward interpretation.
Zariadres conquered Acilisene[12] and possibly also Karenitis (around modern-day Erzurum) and Xerxene (likely a scribal corruption of *Derzene, corresponding to Armenian Derjan)․[13] Another territory mentioned by Strabo, read as either Taronitis (i.e., Taron) or Tamonitis (either Tman[14] or Tmorik[15]), was conquered either by Zariadres[12] or Artaxias.
Zariadres appears to have sent Mithrobouzanes to the court of Ariarathes IV of Cappadocia, which suggests the existence of an alliance between the two kings.