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In Greek mythology, Thetis was the daughter of Nereus and has the ability to shapeshift. She was sought after by both Zeus and Poseidon until they were warned by a prophecy that the child of their union will be greater than the father. That led them to set Thetis up with Peleus instead. From that she gave birth to Achilles, prince of the Myrmidons and main character of the Iliad.