Antiochus I Soter
According to surviving inscriptions, Alexander was already active and held high positions under his paternal uncle Antiochus I Soter. A surviving decree at Bargylia honoring a judge from Teos mentions Alexander as having been ‘left in charge’ by Antiochus I Soter, meaning that Alexander was some sort of governor in the Caria region. The surviving decree at Bargylia dates from 270–261 BC.