 The chapel contains the tomb and gisant of Monseigneur Bertrand de Rosmadec, who died in 1445 and served as chaplain to the dukes Jean IV and Jean V and played an important role in the construction of the cathedral.The chapel window, the "Vitrail de saint Jean-Baptiste", tells the story of John the Baptist's life over 16 individual panels.Panels include depictions of John the Baptist's retreat into the desert, the baptism of Jesus, Salomė's dance and John the Baptist's beheading.