Georgiana Cavendish, Duchess of Devonshire (1757–1806), formerly Lady Georgiana Spencer, and the first wife of the 5th Duke of Devonshire. Very rare ALS in French, signed “Devonshire,” one page, 4 x 6, no date. Letter to her Parisian banker, the financier Perregaux, advising him of her imminent arrival,and asking for the letters addressed to her to be given to the bearer of her letter, John Camsel, and asking him never to mention their money business in public. In part (translated): “Please do not mention our money business to anyone, and never refer to them unless we are alone.” In very good condition, with intersecting horizontal and vertical folds, scattered soiling and staining, brushing of some ink, and a pencil notation at the top of the page. An adjoining page bears the recipient’s name, remnants of a seal, and a missing area of paper. RRAuction COA.