The article focuses on six loose folios once belonging to a Book of Hours, which are now preserved in the Muse“e de l'Acade“mie de la Val d'Ise`re in Mou^tiers-en-Tarentaise. For stylistic reasons, these folios can be ascribed to the so-called First Master of the Hours of Duke Louis of Savoy, who produced most of the illuminations in this sumptuous manuscript, rightly held to be one of the masterpieces of Savoy illumination of the mid fifteenth century (Paris, Bibliothe`que nationale de France, lat. 9473). This artist also decorated another Book of Hours, now in Baltimore (Walters Art Museum, W.292). The Baltimore Book of Hours shows close iconographical affinities with the loose folios of the Mou^tiers Hours, making it possible to hypothesize with relatively certainty the subject of some of the lost illuminations from the Mou^tiers folios. The Baltimore Book of Hours and the Mou^tiers folios bear coats of arms and heraldic emblems that allow us to identify their original owners: in both cases they were important members of the Savoyard nobility who wielded power within the borders of what was the ancient Duchy of Savoy at the end of the Middle Ages.