Mnemosyne — Classical Greek Myth Library

In the *Cypria* Zeus begets Helen not on Leda first, but on Nemesis. To avoid him Nemesis changed shape—fish and beasts—while Zeus pursued, himself transforming (in handbook tellings often as a swan or goose). He overtook her; she bore an egg. A shepherd found the egg and brought it to Leda at Sparta; Leda stored it in a chest until Helen hatched, and raised the child as her own. Twin brothers Castor and Polydeuces may attach to Leda–Zeus or Tyndareus in parallel strands; the Nemesis version’s point is Helen’s parentage in divine Retribution (Nemesis) and Zeus’s will to make her the spark of the Trojan War. Pausanias connects the story to the cult statue of Nemesis at Rhamnus and to dedications linked with Helen’s beauty as instrument of fate. Catalogue this apart from the Leda-swan Apollodorean line: same Helen, different mother and cosmic motive.