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Leda was daughter of the aetolian King Thestius and wife of King Tyndareus of Sparta.

Zeustook the form of a swan to seduce Leda. 

In Greek tradition, the Swan is the symbol of the Muses. The swan also has erotic connotations, such as in the love affair between Zeus and Leda. Also, the Greek Goddess of Beauty and Love, Aphrodite, had a swan-drawn chariot. Besides The swan, as a symbol of music, is also dedicated to Apollo, who was said to transform into a swan.

Back to the retelling: Zeus and Leda had sexual relationships the same night she had slept with her husband. 

Their consummation, on the same night as Leda lay with her husband Tyndareus, resulted in two eggs from which hatched the four children. (Zeus’ s and Tyndareus’).

According to later Greek mythology, Leda bore Helen (later known as Helen of Troy) and Polydeuces, children of…