Claude Humbert Piarron de Chamousset was a French master at the Court of Auditors, physician and philanthropist. He did struggle against the overcrowded hospitals and used his own fortune to take care of poor people in his own hotel. That example was followed, and the 'Hotel-Dieu" was reformed according to his principles. He is quoted in the "Mémoires" of Madame de Genlis . Born in Paris, he was the originator of mutual benefit societies. According to A. Piron (1838), in 1758 he established a new postal system at Paris charging two sols for a single letter under one ounce, replacing the earlier postal system established in 1653 by Jean-Jacques Renouard de Villayer.