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Frances Laura Spencer-Churchill, Duchess of Marlborough (née Charteris; 10 August 1915 – 19 February 1990), was a British noblewoman and socialite. She was variously Viscountess Long, Countess of Dudley and became Duchess of Marlborough upon her fourth marriage, to John Spencer-Churchill, 10th Duke of Marlborough. She was the sister of novelist Hugo Charteris and Ann Charteris (who married Ian Fleming), as well as the granddaughter of Hugo Charteris, 11th Earl of Wemyss. Wikipedia