French nobleman. Born 1761, died 1800. Son of Emmanuel Armand de Vignerot du Plessis de Richelieu d'Aiguillon.
As the second-greatest landowner in France (only excelled by the king), d'Aiguillon was elected to the Estates-General in 1789. On August 4, 1789, d'Aiguillon spearheaded a proposal to remove the feudal privileges of the nobility, a move which caused him to be perceived as a traitor by the nobles.
He held the rank of Marshal in the French Army until August 10, 1792, when he had to leave France because his political sympathies were "suspect". He went into exile in Hamburg, Germany, where he lived until his death.