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 another daughter: Lady Harriet Elizabeth Cavendish, called "Harryo", who would become Countess Granville and also have children of her own. Finally, on 21 May 1790, the duchess gave birth to a male heir to the dukedom: William George Spencer Cavendish, who took the title of Marquess of Hartington at birth, and was called "Hart". He would never marry and became known as "the bachelor duke". With the birth of the Marquess of Hartington, the duchess was able to take a lover. While there is no evidence of when the duchess began her affair with Charles Grey (later Earl Grey), she