Bagadates I (from the Old Iranian Baga-data, "Given by the gods"), also Bagdates or Baydad, is a frataraka or "Keeper of the Fire", and a governor or sub-dynast for the Seleucids, ruling as a priest-king at Istakhr in the former Achaemenid heartland, the territory of Persis (Fars), after Alexander's conquests.