Barbé-Marbois, François, marquis de, 1745-1837. Letter, circa 1800-1834. 1 letter. Location: Misc. François Barbé-Marbois was a councillor of state, director of the Trésor public (Treasury), and a senator under the French Consulate. In 1803 he negotiated the Louisiana Purchase treaty by which Louisiana was ceded to the United States. Barbé-Marbois writes of the precense of the Consul-General of the city hospitals at a reception. In French. Mss. 3712.