Castor and Pollux Castor and Pollux Castor and Pollux (or in Greek, Polydeuces) were twin half-brothers in Greek and Roman mythology, known together as the Dioscuri. Their mother was Leda, but they had different fathers; Castor was the mortal son of Tyndareus, the king of Sparta, while Pollux was the divine son of Zeus, who seduced Leda in the guise of a swan. Though accounts of their birth are varied, they are sometimes said to have been born from an egg, along with their twin sisters Helen of Troy and Clytemnestra. In Latin the twins are also known as the Gemini (literally "twins")
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