دارا الأول
Little is known on the life of Ariobarzanes I. Ariobarzanes I appeared to have succeeded Darius I as king of Media Atropatene in 65 BC, whom appeared to have a short reign. Ariobarzanes I and Darius I were related as they may have been brothers. Although Ariobarzanes I ruled from 65 BC til 56 BC, his reign in the time-scale would appear to preclude the short reign of Darius I and shows that he came to the throne sometime before 59 BC.