Ptolemy III (Ptolemy Euergetes) tŏl´əmē yo͞oûr´jĭtēz [key], d. 221 BC, king of ancient Egypt (246–221 BC), of the Macedonian dynasty, son of Ptolemy II and the first Arsinoë. He plunged immediately into a war with Syria, where his sister, Berenice , was trying to secure the throne for her son. Berenice and her son were murdered before Ptolemy could arrive, and Seleucus II held the throne, though the Egyptian king won a brilliant if impermanent victory. Egyptian fleets controlled most of the coasts of Asia Minor and E Greece, and the kingdom was enlarged by Ptolemy's marriage to Berenice , daughter and heiress of the king of Cyrene.
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