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City of Ætolia on the northern coast of the gulf of Patræ (area 2).
In mythology, Pleuron was founded by a king by that name, one of the sons of Ætolus, the eponym of the Ætolians, himself a son of Endymion, king of Elis, and of Pronoe, the daughter of Phorbas and sister of Augeas, another king of Elis. Pleuron was the brother of Calydon, who founde the nearby city by that name. He married Xanthippe, the daughter of Dorus (the eponym of the Dorians). They had several sons, starting with Agenor, who married Epicaste, the daughter of Calydon, to become king of Pleuron and Calydon (Calydon had no sons). Agenor was the father of Porthaon, who succeded him, and of Demonice, who was loved by Ares and became the mother of Thestius. Thestius became king of Pleuron while Oeneus, the son of Porthaon, became king of Calydon. Thestius was the father of, among others, Althæa and Leda. Althæa became the wife of her uncle Oeneus and the mother of Meleagrus and Deiareina (one of Heracles' wives), while Leda became the wife of Tyndareus, the king of Sparta, while he was in exile at the court of her father after having been unseated by his half-brother Hippocoon. Leda was loved by Zeus under the appearance of a swan and was the mother of Castor and Pollux, Helen and Clytæmnestra.