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
Elizabeth Cavendish, Duchess of Devonshire and afterwards attended her in that city during her fatal illness in March 1824. Lady Elizabeth was a friend of the French author Madame de Staël, with whom she corresponded from about 1804. Lady Elizabeth Foster was depicted by Hayley Atwell in the 2008 film "The Duchess". With John Thomas Foster: With William Cavendish, 5th Duke of Devonshire (prior to their marriage): Elizabeth Cavendish, Duchess of Devonshire Elizabeth Christiana Cavendish, Duchess of Devonshire (13 May 1758 – 30 March 1824) was an English novelist and duchess. She is best known as Lady Elizabeth Foster, the close friend of Georgiana Cavendish,