About Emmanuel-Armand de Richelieu, duc d'Aiguillon
Emmanuel-Armand de Vignerot du Plessis-Richelieu, duc d'Aiguillon (31 July 1720 β 1 September 1788), was a French soldier and statesman, and a nephew of Armand de Vignerot du Plessis, 3rd Duke of Richelieu.
He served as the Secretary of State for Foreign Affairs under King Louis XV.