French politician. Born 1720, died 1788. Father of Armand de Vignerot du Plessis de Richelieu d'Aiguillon.
As governor of Bretagne from 1753 to 1768, d'Aiguillon gradually placed himself more and more at odds with the parlement, until he was finally removed from the post. In 1770, he became foreign minister as one of the members of the so-called Triumvirate (with Chancellor Maupeou and Abbé Terray).
By his contemporaries, d'Aiguillon was alleged - probably unfairly - to have been complicitous in the coup d'état of Sweden's King Gustav III in 1772.
Upon the death of King Louis XV of France, in 1774, d'Aiguillon was dismissed as minister, and never regained political influence.
Not to be confused with his relative Armand Emmanuel du Plessis de Richelieu (1766-1822), another prominent French statesman.