 He wrote a "Portrait de feu monseigneur le Dauphin" and was menin to the future Louis XVI, one of the Dauphin's sons.A peer of France, brigadier, maréchal de camp, knight of the ordre du Saint-Esprit, he was chosen to be minister plenipotentiary to the Estates General of the Dutch Republic.He later became French ambassador to Spain, knight of the Golden Fleece, temporary minister of foreign affairs in 1789, then minister of the conseil d'État of Louis XVIII in Verona.