 The altar of the chapel is carved from a single block of limestone from the Berchères quarry, the source of most of the stone of the cathedral.The fresco on the wall dates from about 1200 and depicts the Virgin Mary on her throne.The Three Kings are to her left, and the Apostles Savinien and Potentien to her right The chapel also has a modern stained glass window, the "Mary, Door to Heaven Window", made by Henri Guérin, made by cementing together thick slabs of stained glass.