And at the end of some years they shall join themselves together; for the king's daughter of the south shall come to the king of the north to make an agreement: but she shall not retain the power of her authority; neither shall he stand, nor his arm: but she shall be given up, and they that brought her, and he that begat her, and he that strengthened her in these times.
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Aquinas Study Bible
The daughter of the king of the south: Berenice, daughter of Ptolemeus Philadelphus, given in marriage to Antiochus Theos, grandson of Seleucus. (Challoner)