ACHAEUS, THE PTOLEMIES AND THE FOURTH SYRIAN WAR
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The second half of the 3rd century saw the Seleucid monarchy weaken considerably. The reign of Seleucus II brought difficult battles against Ptolemy III Euergetes (the Third Syrian War) and attempts to overcome massive internal problems. During the war against Egypt, he ultimately managed to recapture northern Syria but Ptolemy III held on to the port of Seleucia Pieria, which was key for the Seleucids, and captured a number of places in Asia Minor. It was there that the Seleucids suffered their greatest territorial losses - they lost almost all their footholds on the coasts of Cilicia, Lycia, Caria and Ionia. The Egyptian king even seized Ainos and Maronea on the Thracian coast. What also had an impact on Seleucus II losing his influences in Asia Minor was his fratricidal war against Antiochus Hierax, backed by the kings of Pergamon, Capadocia and Bithynia. The defeated Seleucus had to reconcile himself with his brother's independence in Asia Minor, the latter, however, subsequently suffered a defeat in his war against Pergamon, which ultimately led to the Seleucids losing their Asian Minor territories. The dynasty also faced enormous challenges in the East, where Bactria and Sogdiana seceded, and Parthia was seized by the Parni.
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