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
Catherine Cavendish, Duchess of Devonshire Catherine Cavendish, Duchess of Devonshire Catherine Cavendish, Duchess of Devonshire (1700 – 8 May 1777), formerly Catherine Hoskins (or Hoskyn), was the wife of William Cavendish, 3rd Duke of Devonshire, and mother of the 4th Duke. She was the only child and heiress of John Hoskins of Oxted (1640–16 May 1717), and his wife, the former Catherine Hale (1673–1703). Her mother's brother was the judge, Sir Bernard Hale, and her first cousins were the army generals Bernard and John Hale. She married Cavendish, then an MP and known as the Marquess of Hartington, on 27 March 1718. The Marquess inherited