The chapel is dedicated to saint Gilduin, an archdeacon at Dol who refused the bishopric offered by Pope Gregory VII and saint Méen who was a disciple of saint Samson. The altar altarpiece and statues are by Jean-Marie Valentin and date to 1873 and the chapel's oil paintings are the work of the Rennes artist Lemoine. The stained glass tells us something of saint Gilduin; his refusal of the bishopric, his illness, his transfer to Notre-Dame in Chartres and his death. They also depict saint Méen amongst the sick. A reliquary on the altar in gilded bronze contains relics of these two saints.