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.
Tyndareus Tyndareus In Greek mythology, Tyndareus (; Ancient Greek: Τυνδάρεος, "Tundáreos"; Attic: Τυνδάρεως, "Tundáreōs"; ) was a Spartan king. Tyndareus was the son of Oebalus (or Perieres) and Gorgophone (or Bateia). He married the Aetolian princess, Leda by whom he became the father of Castor, Clytemnestra, Timandra, Phoebe and Philonoe, and the stepfather of Helen of Troy and Pollux. Tyndareus had a brother named Hippocoon, who seized power and exiled Tyndareus. He was reinstated by Heracles, who killed Hippocoon and his sons. Tyndareus’ other brother was Icarius, the father of Penelope. Tyndareus’ wife Leda was seduced by Zeus, who disguised himself