We also encounter the memory of the region's most important literary figures: Arnaut Daniel, Bertran de Born, Michel de Montaigne, Étienne de La Boétie, Brantôme, Fenelon, Maine de Biran, Eugene Le Roy, and André Maurois; its great captains: Talleyrand, Saint-Exupery, Biron; and even entertainer and activist Josephine Baker. A number of ruins (La Chapelle-Faucher, I'Herm) have retained the memory of the tragedies that took place within their walls. Several of the castles and châteaux are open to visitors; some of them, such as Bourdeilles and Mareuil, house noteworthy collections.