Marie de Rabutin-Chantal, marquise de Sévigné (1626–1696), French aristocrat and witty letter writer. Her correspondence with her daughter was published in 1725. Letters to other recipients were published in subsequent years.
Claude Henri de Rouvroy, comte de Saint-Simon (1760–1825), born French aristocrat, early socialist theorist. He proposed a new Christianity, redueced to its essential elements. "The whole of society ought to strive towards the amelioration of the moral and physical existence of the poorest class; society ought to organize itself in the way best adapted for attaining this end."