| Also known as the Laodicean War, the Third Syrian War began with one of the many succession crisis that plagued the Hellenistic states. Antiochus II left two ambitious mothers, his repudiated wife Laodice and Ptolemy II's daughter Berenice Syra, in a competition to put their respective sons on the throne. Laodice claimed that Antiochus had named her son heir while on his deathbed, but Berenice argued that her newly born son was the legitimate heir. Berenice asked her brother Ptolemy III, the new Ptolemaic king, to come to Antioch and help place her son on the throne. When Ptolemy arrived, Berenice and her child had been assassinated. Ptolemy declared war on Laodice's newly crowned son, Seleucus II, in 246 BC, and campaigned with great success. He won major victories over Seleucus in Syria and Anatolia, briefly occupied Antioch and, as a recent cuneiform discovery proves, even reached Babylon. These victories were marred by the loss of the Cyclades to Antigonus Gonatas in the Battle of Andros. Seleucus had his own difficulties. His domineering mother asked him to grant co-regency to his younger brother, Antiochus Hierax, as well as rule over Seleucid territories in Anatolia. Antiochus promptly declared independence, undermining Seleucus' efforts to defend against Ptolemy. In exchange for a peace in 241, Ptolemy was awarded new territories on the northern coast of Syria, including Seleucia Pieria, the port of Antioch. The Ptolemaic kingdom was at the height of its power. | 
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