Hellenopolis was a city in Anatolia (perhaps Bithynia or Mysia) founded by an Attalus, by gathering together the inhabitants of a number of Greek cities.
Mithridates of Cius (in Greek Mιθριδάτης or Mιθραδάτης; lived c. 386–302 BC, ruled 337–302 BC) succeeded his kinsman or father Ariobarzanes II in 337 BC as ruler of the Greek town of Cius in Mysia (today part of Turkey).
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Between 362 and 337 BCE the family fiefdom of Cius in Mysia was held by Ariobarzanes II (possibly Mithridates' brother).