Louis de Rouvroy, duc de Saint-Simon

Louis de Rouvroy (16 January 1675 – 2 March 1755), Duke of Saint-Simon, styled duc de Saint-Simon, was a French soldier, diplomat and a noted diarist; he was born in Paris (Hôtel Selvois, 6 rue Taranne, today at 175 Bvd. Saint-Germain).

The family's ducal peerage (duché-pairie), granted to his father Claude de Rouvroy (1608–1693), served as both perspective and theme in Saint-Simon's life and writings.