Helen being Rescued by Castor and Pollux. 1817. Jean Bruno Gassies. French 1786-1832. oil/canvas. Sotheby’s upcoming Auction. Jan. 29.2015. This painting was Gassies’s entry for the 1817 Prix de Rome competition for history painting. The subject chosen for that year was an episode from Plutarch’s Life of Theseus which recounts the rescue by twin brothers, Castor and Pollux, of their sister Helen, who had been abducted by Theseus.