A complete illuminated manuscript in 52 full page color plates Bérault Stuart, seigneur d'Aubigny (c. 1452-1508) was a French soldier anddiplomat who belonged to the notable Scottish family the Stewarts of Darnley.Over a distinguished career he served as chamberlain and royal counselor to theKing of France and held various military and diplomatic positions in service ofthe monarchy. In 1508, shortly before his death, he dictated the Traité Sur l'Artde la Guerre (Treatise on the Art of War) to his chaplain. The treatise is apractical discourse on warfare and statecraft, drawing on contemporary worksand his own military experience. The present manuscript, held by the BeineckeRare Book and Manuscript Library, Yale University, is one of a small number ofsurviving manuscripts of the work.