JAUCOURT, Paul de (zho'-koor.'), Flemish soldier, born in Malines in 1754; died in Paris in 1793. He was a lieutenant in the Austrian army when the American Revolution began, and, having sent in his resignation, he accompanied, in 1779, his friend, the Chevalier de Chastellux, to the United States, where he served as a volunteer. He was adjutant to the Count of Saint Simon at Yorktown in 1781. When peace was signed, he entered the French service, and went to Cayenne as a major of artillery in 1785. He submitted to the governor designs for the fortifications of Cayenne, and was permitted to carry them out. But the events of the revolution interrupted the works, and he was arrested on suspicion of being a royalist, and sent to Paris in 1798, where he was sentenced to death, and executed in November.