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
Leda and the Swan were derivative of the compositions mentioned above. The subject remained largely confined to Italy, and sometimes France – Northern versions are rare. After something of a hiatus in the 18th and early 19th centuries (apart from a very sensuous Boucher,), Leda and the Swan became again a popular motif in the later 19th and 20th centuries, with many Symbolist and Expressionist treatments. Also from that era were sculptures of the theme by Antonin Mercié and Max Klinger. Cy Twombly executed an abstract version of "Leda and the Swan" in 1962. It was purchased by Larry Gagosian for $52.9 million at