Duke of Devonshire a separate title from that of Earl of Devon, which still belongs to the Courtenay family. The fifth Duke and Duchess of Devonshire are portrayed in the 2008 film "The Duchess" directed by Saul Dibb. The film is based on Amanda Foreman's biography of the scandalous 18th-century English aristocrat Georgiana Cavendish, Duchess of Devonshire (portrayed by Keira Knightley) and her relationship with the Duke (Ralph Fiennes) and his next wife, Lady Elizabeth Foster. Along with Jane Austen, the fifth Duke and his second wife appear, soon after Georgiana's death, in "Jane and the Stillroom Maid", a murder mystery by Stephanie
Georgiana Cavendish, Duchess of Devonshire between the two women (and the difficult position her new friend was in), with the Duke's acquiescence, the duchess agreed to having Lady Elizabeth live with them. When the Duke began a sexual relationship with Lady Elizabeth, a ménage à trois (love triangle) was established and it was arranged that Lady Elizabeth live with them permanently. While it was common for male members of the upper class to have mistresses, it was not common or generally acceptable for a mistress to live so openly with a married couple. Furthermore, the duchess had become emotionally dependent on Lady Elizabeth whom she