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Enipeus, in ancient Greece, was a river god, son of Oceanus and Tethys. Enipeus was loved by a mortal woman named Tyro, who was married to a mortal man named Cretheus. She pursued Enipeus, who refused her advances. One day, Poseidon, filled with lust for Tyro, disguised himself as Enipeus and from their union was born Pelias and Neleus, twin boys. The River Enipeus (now Enipeas) is located in Thessaly, and was a key factor in the Battle of Pharsalus.