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In page Ptolemy III Euergetes:

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In the late 250s BC, Ptolemy II arranged the engagement of Ptolemy III to Berenice, the sole child of King Magas of Cyrene.[8] The decision to single Ptolemy III out for this marriage indicates that, by this time, he was the heir presumptive. On his father's death, Ptolemy III succeeded him without issue, taking the throne on 28 January 246 BC.[4]