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 entire debts. Meanwhile, Lady Elizabeth fought to keep Cavendish properties to which she wasn't entitled; furthermore, the 6th Duke denied her demand that her illegitimate son with the 5th Duke of Devonshire, Clifford, bear the Cavendish crest. Infuriated, Lady Elizabeth brought back up her affair with the 5th Duke of Devonshire by publicly announcing he had sired her illegitimate children. The 6th Duke of Devonshire finally oversaw an end to it all - the mistake of his late mother of bringing in Lady Elizabeth into her life and all the ensuing consequences - with the final dismissal of Lady Elizabeth