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
Mary Cavendish, Duchess of Devonshire from 1955 to 1972. She was awarded Hon. LLD (Exon) in 1956. On 26 November 1950, her husband Edward Cavendish, 10th Duke of Devonshire, had a heart attack and died while being attended by John Bodkin Adams, the suspected serial killer. In the process of transferring his assets to his son, the death of the Duke fell 10 weeks prior to a required 5-year period, and his estate was subjected to taxes of 80%. His widow died in Westminster, London, aged 93. Mary Cavendish, Duchess of Devonshire Mary Cavendish, Duchess of Devonshire, (29 July 1895 – 24 December 1988) was