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 full consent of her natural protectors. "Cypria" narrate that in just three days Paris and Helen reached Troy. Homer narrates that during a brief stop-over in the small island of Kranai, according to "Iliad", the two lovers consummated their passion. On the other hand, "Cypria" note that this happened the night before they left Sparta. At least three Ancient Greek authors denied that Helen ever went to Troy; instead, they suggested, Helen stayed in Egypt during the duration of the Trojan War. Those three authors are Euripides, Stesichorus, and Herodotus. In the version put forth by Euripides in his play