Antiochus II was a King of ancient Syria ( 261 -247 BC ) , son and successor of Antiochus I. In warfare with Ptolemy II, he had sporadic successes, but his marriage to Ptolemy II 's daughter Berenice, sealed the peace and most of the Syrian possessions which his father had lost were restored back to Antiochus II. On the death of Antiochus II, his son by an earlier marriage Seleucus II, and Berenice on behalf of her infant son struggled for the throne and a long war with Ptomely III ensued.
Seleucus II a King of ancient Syria ( 246 - 226 BC ) was the son of Antiochus II. On his father 's death, there was a struggle for the throne between Seleucus II and his stepmother Berenice ( on behalf of his infant son ) Seleucus II seems to have murdered both Berenice and her son before her brother Ptolemy III of Egypt could arrive. A long war with Ptolemy III ensued. Seleucus also had to wage war with his own brother Antiochus Hierax for Asia Minor. Bactria and Parthia revolted and threw off Seleucus II control. He was succeeded by his son Seleucus III who was killed after a three-year reign. Another son Antiochus III became king