St. Simon, Louis de Rouvroy, Duc de, French courtier and diplomatist in the reign of Louis XIV.; left “Memoirs” in record of the times he lived in, depicting with remarkable sagacity the manners of the Court and the characters of the courtiers (1676‒1755).
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
St. Simon, Claude Henri, Comte de * St. Simonians