Infamous French courtesan (1743–1793) who was the last mistress of Louis XV. Accused of aiding emigres from the Revolution, she was imprisoned, tried, and executed during the Reign of Terror. ALS in French, signed “Le Comtesse du Barry,” one black-bordered page, 6 x 3.5, December 1786. Untranslated letter instructing her banker to pay an account from her lumber merchant. In fine condition, with vertical folds, a bit of mild toning, and some light show-through from docketing notations on reverse. RR Auction COA.