An interesting copy of the Livre du roi Modus et de la reine Racio is preserved in Vienna (Österreichische Nationalbibliothek, 2611). The manuscript was probably made in Chambéry under the commission of Antoine d'Orlier, a close adviser to the duchess Yolande of France. Its decoration is attributed to a Northern French artist; in reality, it is a precious witness to Savoy's artistic production during the third quarter of the 15th century. The manuscript is richly ornamented with fifty-four illuminations, which we attribute to the Master of the Prince of Piedmont between 1465 and 1470. The manuscript is strictly contemporary to the Deloche Hours (Turin, Museo Civico, inv. 389). Based on this attribution, the paper reflects on the career of this curious illuminator and his artistic imprint both in Lyon and Geneva, emphasising the continuity of artistic exchanges between these two centres at that time.