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Male Ptolemy III Euergetes Lagid Click to view Ptolemy III Euergetes Lagid in the family tree Click to view Ptolemy III Euergetes Lagid in the family tree in SVG format

Ptolemy III's father was Ptolemy II Philadelphus Egypt and his mother was Arsinoe I Thrace.  His paternal grandparents were Ptolemy  Soter I Egypt and Berenice I Egypt; his maternal grandparents were  Lysimachos Thrace and  Nicea Macedonia.  He was the oldest of two children.  He had a sister named Berenice.

Ptolemy III's family with Berenice II Cyrene

Ptolemy III and Berenice II were married (further details are not known). They had a son and a daughter, named Ptolemy IV and Arsinoe III.