SERCEY, Pierre Cesar Charles Guillaume, Marquis de, French naval officer, born near Autun, 26 April, 1753; died in Paris, 10 August, 1836. He entered the navy in 1766, was commissioned ensign in May, 1779, and served under the Count de Ouichen. For his participation in several dangerous enterprises during the siege of Pensacola, Florida, he was made lieutenant and given the cross of St. Louis. On his return to France he was ordered to the command of " La Surveillant" in 1790, and sailed for Martinique. He was promoted captain in 1792, and in January, 1793, was ordered to convoy to France all the merchant vessels in those waters. He had collected more than fifty ships laden with valuable cargoes, when the rising of the negroes in Santo Domingo occurred. He rescued 6,000 of the colonists. As his scanty supply of provisions and the feebleness of his naval force did not permit of his attempting to cross the Atlantic, he set sail for the coast of New England, where he arrived in safety. On his return to France in December he was imprisoned for six months for being of noble birth. In December, 1795, he was given command of the naval force that was detailed to accompany the two civil commissioners that were charged with the execution of the decree giving liberty to the blacks in Mauritius and Reunion. Sercey, fearing that scenes similar to those he had witnessed at Santo Domingo might be enacted there, warned the colonists of the nature of the commissioners' errand, and they were in consequence not allowed to land. In 1804, at his earnest request, he was placed on the retired list, and sailed for the Mauritius, which he gallantly defended against the English in 1810. On the declaration of peace in 1814 he was appointed president of the commission to negotiate in England for the exchange of French prisoners. On his return to France he was promoted vice-admiral, .again placed on the retired list in April, 1832, and became a member of the house of peers.