 After nine generations in the castle, the reign of the Châteauneufs ended in tragedy when in 1456 the last heiress, Catherine de Châteauneuf, was burnt alive for poisoning her second husband, Jacques d'Haussonville.In 1457, Philippe le Bon, duke of Burgundy, offered the fortress to his advisor Philippe Pot, also of the Order of the Golden Fleece () and a knight of Saint Michael.He then modified the castle to make it more comfortable as a residence, in keeping with the style of the court of the Duchy of Burgundy.