Berenice, c.273–21 BC, queen of ancient Cyrene and Egypt. She was the daughter and successor of King Magas of Cyrene. In 247 BC she married Ptolemy III , thereby effectively annexing Cyrene to Egypt. According to Callimachus and Catullus, he named a constellation after her, Berenice's Hair (Coma Berenices). After her husband's death she ruled jointly with their son, Ptolemy IV , until he had her put to death.

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