Berenice bĕrənī´sē [key], b. c.340 BC, d. 281 or 271 BC, consort and half-sister of Ptolemy I, king of ancient Egypt. A Macedonian, she was the widow of Philip, one of the officers of Alexander the Great, and was by this marriage the mother of Magas, king of Cyrene; Antigone, wife of Pyrrhus of Epirus; and Theoxena, wife of Agathocles, ruler of Syracuse. Berenice, whose portrait appears with that of Ptolemy on many medals, was the mother by him of Ptolemy II and Arsinoë II.

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