Claude-Anne de Rouvroy de Saint Simon

Claude-Anne de Rouvroy de Saint Simon (French pronunciation: [klod an ʁuvʁwa sɛ̃ simɔ̃]; Château de la Faye, Deviat, 16 March 1743 – Madrid, 3 January 1819), Marquis of Saint-Simon and Montblerú, Grandee of Spain, since 1814 Duke of Saint-Simon (Spanish title), was a French noble, military and politician of the 18th and 19th centuries.