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
Margaret Cavendish, Duchess of Newcastle-upon-Tyne Margaret Cavendish, Duchess of Newcastle-upon-Tyne Margaret Lucas Cavendish, Duchess of Newcastle-upon-Tyne (1623 – 15 December 1673) was an English aristocrat, philosopher, poet, scientist, fiction-writer, and playwright during the 17th century. Born Margaret Lucas, she was the youngest sister of prominent royalists Sir John Lucas and Sir Charles Lucas, who owned the manor of St. John's Abbey in Colchester. She became an attendant of Queen Henrietta Maria and traveled with her into exile in France, living for a time at the court of the young King Louis XIV. She became the second wife of William Cavendish, 1st Duke of Newcastle-upon-Tyne in