The residence of a faithful companion-in-arms to Joan of Arc. John of Dunois, known as the 'Bastard of Orleans' and half-brother of King Charles VI, transformed the old feudal castle into a bright, comfortable dwelling and added the Holy Chapel. His grandson, Francis II of Orleans-Longueville, extended the château with a wing in the Renaissance style heralding the great châteaux of the Loire Valley. Works started around 1450 but were not completed until 1530.