Cleopatra had a son with Caesar.
Caesarion . He was the eldest son of Cleopatra VII , and possibly the only biological son of Julius Caesar , after whom he was named . Cleopatra VII Philopator ( Κλεοπάτρα Φιλοπάτωρ 69 -- August 12 , 30 BC ) , known to history simply as Cleopatra , was the last active ruler of Ptolemaic Egypt , briefly survived as pharaoh by her son Caesarion . She later elevated Caesarion , her son with Caesar , to co-ruler in name .