Ptolemy was the son of Lysimachus and deified Arsinoë II. The date and place of his birth have not been found.
Ptolemy
Lysimachus (0362/61BC-0281BC)
deified Arsinoë II (0316BC-0270BC)
Ptolemy I Soter (c0267BC-0283BC)
Lagos of Macedon
Arsinoë of Macedon
Berenice I of Egypt
Magas of Macedon
Antigone of Macedon