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
Georgiana Cavendish, Duchess of Devonshire George. (The daughter of her sister Henrietta, Lady Caroline Lamb, would become a writer and lover of Lord Byron). Mr John Spencer, great-grandson of John Churchill, 1st Duke of Marlborough, came from a wealthy English noble family. He built a Spencer family residence at St. James's, London and raised his children there. The parents raised Georgiana and her siblings in a happy marriage which bears no record of there ever having been any extramarital affairs - a rarity in the era. Meanwhile, Georgiana grew to be close to her mother who was said to favour Georgiana over her other children.