Deborah Cavendish, Duchess of Devonshire Deborah Cavendish, Duchess of Devonshire Deborah Vivien Cavendish, Duchess of Devonshire, (born Deborah Freeman-Mitford and latterly Deborah, Dowager Duchess of Devonshire; 31 March 1920 – 24 September 2014) was an English aristocrat, writer, memoirist and socialite. She was the youngest and last surviving of the six Mitford sisters, who were prominent members of English society in the 1930s and 1940s. Known to her family as "Debo", Deborah Mitford was born in Asthall Manor, Oxfordshire, England. Her parents were David Freeman-Mitford, 2nd Baron Redesdale (1878–1958), son of Algernon Freeman-Mitford, 1st Baron Redesdale, and his wife, Sydney (1880–1963), daughter of Thomas Gibson
Diana Mitford but were barred from all functions at the British Embassy. During their time in France, the Mosleys quietly went through another marriage ceremony; Hitler had safeguarded their original marriage licence, and it was never found after the war. During this period, Mosley was unfaithful to Diana, but she found for the most part that she was able to learn to keep herself from getting too upset regarding his adulterous habits. The only time she and sister Jessica communicated with each other following their estrangement was when they were both taking care of their sister Nancy. Nancy was at Versailles, and