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.
HMS Leda (1892) HMS Leda (1892) HMS "Leda" was a of the British Royal Navy. She was built by Sheerness Dockyard from 1891–1893. She was converted to a minesweeper in 1908–1909 and continued these duties during the First World War. "Leda" was scrapped in 1922. "Leda" was one of 11 "Alarm"-class torpedo gunboats ordered for the Royal Navy under the 1889 Naval Defence Act, which authorised the shipbuilding programme for the next five years, and also included the last two torpedo-gunboats of the and the five torpedo-gunboats of the . The "Alarm"s were slightly modified versions of the previous "Sharpshooter"-class, with modified engines