Helen of Troy refuge with Leda. The swan gained her affection, and the two mated. Leda then produced an egg, from which Helen emerged. The First Vatican Mythographer introduces the notion that two eggs came from the union: one containing Castor and Pollux; one with Helen and Clytemnestra. Nevertheless, the same author earlier states that Helen, Castor and Pollux were produced from a single egg. Pseudo-Apollodorus states that Leda had intercourse with both Zeus and Tyndareus the night she conceived Helen. On the other hand, in the "Cypria", part of the Epic Cycle, Helen was the daughter of Zeus and the goddess Nemesis.
Leda (mythology) Leda (mythology) In Greek mythology, Leda (; Ancient Greek: Λήδα ) was an Aetolian princess who became a Spartan queen. Her myth gave rise to the popular motif in Renaissance and later art of Leda and the Swan. Leda was the daughter of the Aetolian king Thestius hence she was also called Thestias. Her mother was either Leucippe or Deidameia, daughter of Perieres, or else Eurythemis, daughter of Cleoboea, or Laophonte, daughter of Pleuron. According to Alcman, Leda's parents were Glaucus and Laophonte while Eumelus attested that they are Sisyphus and Panteiduia or Paneidyia She married king Tyndareus of Sparta