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In Greek mythology, Leda (Λήδα) was daughter of the Aetolian king Thestius, and wife of the king Tyndareus of Sparta.
Leda was admired by Zeus, who seduced her in the guise of a swan. As a swan, Zeus fell into her arms for protection from a pursuing eagle. Their consummation, on the same night as Leda lay with her husband Tyndareus, resulted in two eggs from which hatched Helen — later known as the beautiful "Helen of Troy" — Clytemnestra, and Castor and Pollux. Which children are the progeny of Tyndareus, the mortal king, and which are of Zeus, and are thus half-immortal, is not consistent among accounts, nor is which child hatched from which egg. The split is almost always half mortal, half divine, although the pairings do not always reflect the children's heritage pairings. Castor and Polydeuces are sometimes both mortal, sometimes both divine. One consistent point is that if only one of them is immortal, it is Polydeuces.