This thesis examines the struggle between King Louis XI and the great feudal houses of the fifteenth century such as Burgundy, Brittany, Anjou, Armagnac, Bourbon, and Foix. It attempts to provide a detailed narrative based on the primary sources and the excellent studies on individual feudal princes produced by a number of French historians, supplemented by a critical analysis of the traditional view of Louis XI as the "vainquer de la grande féodalité."