 In that war, Antiochus III had completely defeated the Ptolemaic forces, had annexed Coele-Syria and Judaea to his empire, and reduced Egypt to a subordinate position.The new situation was solidified with a peace treaty, under which Ptolemy V married Antiochus' daughter Cleopatra I in 194 BC.Ptolemy VI was the eldest son of the couple, born in 186 BC, probably in May or June.