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.
Europa (consort of Zeus) (by this case, niece of former) is also loved by Zeus, but because of the same name, gave some confusions to others. After arriving in Crete, Europa had three sons fathered by Zeus: Minos, Rhadamanthus, and Sarpedon, the three of whom became the three judges of the Underworld when they died. In Crete she married Asterion also rendered Asterius and became mother (or step-mother) of his daughter Crete. There were two competing myths relating how Europa came into the Hellenic world, but they agreed that she came to Crete (Kríti), where the sacred bull was paramount. In the more familiar