Ptolemy XV Philopator Philometor Caesar, nicknamed Caesarion (little Caesar) Greek: Πτολεμαίος ΙΕ' Φιλοπάτωρ Φιλομήτωρ Καίσαρ, Καισαρίων (June 23, 47 BC – August, 30 BC) was the last king of the Ptolemaic Dynasty of Egypt, who reigned, as a child, jointly with his mother, Cleopatra VII from September 2, 44 BC to August, 30 BC, when he was killed by Octavian, who would become the Roman emperor Augustus.