Leda in Wikipedia
In Greek mythology, Leda (Λήδα) was daughter of the Aetolian
king Thestius, and wife of the king Tyndareus (Τυνδάρεως),
of Sparta. Her myth gave rise to the popular motif in
Renaissance and later art of Leda and the Swan. She was the
mother of Helen (Ἑλένη) of Troy, Clytemnestra
(Κλυταιμνήστρα), and Castor and Pollux (Κάστωρ & Πολυδεύκης,
spelled Kastor and Polydeuces).
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 (also
known as the Dioscuri (Διόσκουροι). 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...
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