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.
Helen of Troy was "the famous egg that legend says Leda brought forth". Pausanias traveled to Sparta to visit the sanctuary, dedicated to Hilaeira and Phoebe, in order to see the relic for himself. Two Athenians, Theseus and Pirithous, thought that since they were both sons of gods, both of them should have divine wives; they thus pledged to help each other abduct two daughters of Zeus. Theseus chose Helen, and Pirithous vowed to marry Persephone, the wife of Hades. Theseus took Helen and left her with his mother Aethra or his associate Aphidnus at Aphidnae or Athens. Theseus and Pirithous then traveled