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.
Dardanus (son of Zeus) Dardanus (son of Zeus) In Greek mythology, Dardanus (; Ancient Greek: Δάρδανος, "Dardanos") was a son of Zeus (in Illyrius) and Electra (daughter of Atlas) and founder of the city of Dardanus at the foot of Mount Ida in the Troad. Dionysius of Halicarnassus (1.61–62) states that Dardanus' original home was in Arcadia, where Dardanus and his elder brother Iasus (elsewhere more commonly called Iasion) reigned as kings following Atlas. Dardanus married Chryse, daughter of Pallas, by whom he fathered two sons: Idaeus and Deimas. When a great flood occurred, the survivors, who were living on mountains that had now