The Innocent (Italian: L'innocente) was the last film made by Italian director Luchino Visconti. Released in 1976, the film is based on the novel The Intruder by Gabriele d'Annunzio. It was distributed in the U.S. by Analysis Film Releasing Corp.
The main shooting locations were the Villa Mirafiori in Rome, the Villa Butori in Lucca and the Villa Bellosguardo nearby. The soundtrack includes Wolfgang Amadeus Mozart's Rondò Alla Turca and the aria Che farò senza Euridice from Christoph Willibald Gluck's Orfeo ed Euridice.
The story is set in the late nineteenth century. Tullio Hermil (Giancarlo Giannini), a wealthy Roman aristocrat married to Giuliana (Laura Antonelli), has a possessive aristocratic mistress, Teresa Raffo (Jennifer O'Neill), and neglects his wife.
(Summary from Wikipedia)