Castor and Pollux horse breaker and the boxer / Polydeuces, my brothers" ..." – Helen, "Iliad" 3.253–255), but in the "Odyssey" they are treated as alive even though "the corn-bearing earth holds them". The author describes them as "having honour equal to gods", living on alternate days because of the intervention of Zeus. In both the "Odyssey" and in Hesiod, they are described as the sons of Tyndareus and Leda. In Pindar, Pollux is the son of Zeus while Castor is the son of the mortal Tyndareus. The theme of ambiguous parentage is not unique to Castor and Pollux; similar characterisations appear in
Helen of Troy The date of the "Cypria" is uncertain, but it is generally thought to preserve traditions that date back to at least the 7th century BC. In the "Cypria", Nemesis did not wish to mate with Zeus. She therefore changed shape into various animals as she attempted to flee Zeus, finally becoming a goose. Zeus also transformed himself into a goose and raped Nemesis, who produced an egg from which Helen was born. Presumably, in the "Cypria", this egg was somehow transferred to Leda. Later sources state either that it was brought to Leda by a shepherd who discovered it in