The choice of castles in the calendar is one factor in the dating of the brothers' contribution. The Château of Bicêtre, just outside Paris, was one of Berry's grandest residences, but does not appear in the calendar. It seems likely that this was because no image had been created by October 1411, when a large mob from Paris looted it and set it on fire in the Armagnac–Burgundian Civil War. However the châteaux at Dourdan (April) and Étampes (July) are both shown, although Berry lost them to the Burgundians at the end of 1411, with Étampes being badly damaged in the siege.