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)
As we have already said, it was Seleucus, surnamed Nicanor, who first ruled over Syria. The second king was Antiochus, who was called Soter. The third was Antiochus himself, (705) who was called Theos, that is the Divine. He was the one who waged numerous wars with Ptolemy Philadelphus, who was the second ruler in Egypt, and he also fought with all the Babylonians and the men of the East, And so after |122 many years Ptolemy Philadelphus wished to have done with this vexatious struggle, and so he gave his daughter, named Berenice, in marriage to Antiochus, who had already had by a previous wife, named Laodice, two sons, namely Seleucus, surnamed Callinicus, and the other, Antiochus. And Philadelphus conducted her as far as Pelusium and bestowed countless thousands of gold and silver by way of a dowry, from which circumstance he acquired the nickname of phernophoros or Dowry-giver (dotalis). But as for Antiochus, even though he had said he would regard Berenice as his royal consort and ...