Queen of Egypt, third wife of Ptolemy I Soter, and mother of Arsinoe II and Ptolemy II Philadelphus.
Berenice arrived in Egypt in the retinue of Eurydice, Ptolemy's second queen, whom he married as part of a political agreement with her father, Antipater of Macedonia. About 317 Ptolemy married Berenice. Probably because she was not of royal blood, a genealogy was fabricated to make her a half sister of the king. In 308 Berenice gave birth to Ptolemy II Philadelphus, and in 290 Ptolemy made her queen of Egypt. In 285 Ptolemy II was made co-regent and successor to his father, bypassing Eurydice's children. Ptolemy II's second wife was his sister Arsinoe II, also the child of Berenice.