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
Louisa Cavendish, Duchess of Devonshire Louisa Cavendish, Duchess of Devonshire Louisa Frederica Augusta Cavendish, Duchess of Devonshire, formerly Louisa Montagu, Duchess of Manchester, née Luise Fredericke Auguste, Countess von Alten (15 June 1832 – 15 July 1911) was a German born British aristocrat sometimes referred to as the "Double Duchess" due to her marriage to both the Duke of Manchester and the Duke of Devonshire. Louisa Frederica Augusta, Countess von Alten was born 15 June 1832 in Hanover in what was then the Kingdom of Hanover. She was the daughter of (1800–1879), and his wife, Hermine de Schminke (1806–1868). Her siblings included Helene Charlotte Auguste,