 It was Nouvel de la Flèche who had had Yann Dargent execute the various frescoes in the cathedral, originally commissioned by his predecessor, Monseigneur Sergent, who had had the apsidal chapel restored by Bigot and had had the relic of Saint Corentin placed in the Saint Corentin chapel.Canon Jean de Marc'hallac'h is also buried in the chapel.The stained glass window relates, in 16 medallions, the story of Saint-Corentin's life.