Ptolemy I Philopator Philometor Caesar Augustus of Diadochia (Greek: Πτολεμαίος Α 'Φιλοπάτωρ Φιλομήτωρ Καίσαρ, Ptolemaíos A 'Philopáto̱r Philomí̱to̱r Kaísar (25 March 31 BC - 23 September 35 AD) was the first member of the Argead-Ptolemaic dynasty of Diadochia. He reigned jointly with his mother Empress Cleopatra VIII from 27 BC until his mother died in 16 June 7 BC.