Louis de Rouvroy, duc de Saint-SimonLouis de Rouvroy, Duke of Saint-Simon, GE (16 January 16752 March 1755), was a French soldier, diplomat and memoirist. He was born in Paris at the Hôtel Selvois, 6 rue Taranne (demolished in 1876 to make place for the Blvd Saint-Germain). The family's ducal peerage (''duché-pairie''), granted in 1635 to his father Claude de Rouvroy (1608–1693), served as both perspective and theme in Saint-Simon's life and writings. He was the second and last Duke of Saint-Simon.
His enormous memoirs are a classic of French literature, giving the fullest and most lively account of the court at Versailles of Louis XIV and the Régence at the start of Louis XV's reign. Provided by Wikipedia