The «Livre des cens» of La Ferté-Bernard, in the Perche, established soon after 1390, at the time when Guillaume de Craon was taking up the fee lately seized from his brother Pierre, states all the rents and corvées due and decribes minutely two manors and seventeen métairies. The examination of these «belongings» allows to define their condition (buildings and land), to assess in a rather precise fashion the size of the farms and the rotation of crops (corn-fields and pasture land) and also to measure the result of a policy conducted by the former lord.Le «Livre des cens» de la seigneurie de la Ferté-Bernard, dans le Perche, établi peu après 1390, au moment où Guillaume de Craon reprend en mains le fief naguère confisqué à son frère Pierre...