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 and the Swan (Peter Paul Rubens) she is most known for giving birth to Clytemnestra, Helen, Pollux, and Castor. The most common myth claims that Zeus transformed himself into a swan to couple with Leda. Some versions claim that she loved Zeus and willing had sexual relations with him, while other versions claim she was seduced and therefore was not willing. That same night, she coupled with Tyndareus also. Leda then gave birth to four children at the same time. The two pairs of twins resulted in Helen and Pollux belonging to Zeus, and Clytemnestra and Castor belonging to Tyndareus. Though each pair is attributed to