Marshal of France, natural son of Augustus II., king of Poland (q. v .) distinguished himself under various war captains, Marlborough and Prince Eugene in particular, and eventually entered the service of France; commanding in the War of the Austrian Succession he took Prague and Egra, and was made a marshal, and appointed to the command of the army of Flanders, in which he gained victories and captured fortresses, and was thereafter loaded with honours by Louis XV.; was one of the strongest and most dissolute men of his age; died of dropsy, the result of his debaucheries (1698-1750).