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
Evelyn Cavendish, Duchess of Devonshire Evelyn Cavendish, Duchess of Devonshire Evelyn Emily Mary Cavendish, Duchess of Devonshire, (née Petty-FitzMaurice; 27 August 1870 – 2 April 1960) was the wife of The 9th Duke of Devonshire. She was born the elder daughter of the politician and diplomat The 5th Marquess of Lansdowne, and grew up amidst public life. Evelyn's marriage to Cavendish, the heir of The 8th Duke of Devonshire, led to her becoming Duchess of Devonshire in 1908. With her position, she oversaw the reorganisation of the Devonshire estates and presided over four English houses and one Irish castle. Evelyn held the position of Mistress