 The building we see today was commenced in around 1180 during the episcopacy of Bishop Geffroy de Hénon and building was well advanced when in 1212 Bishop Pierre was buried at the base of the Tour Brieuc.Pierre had brought the Saint-Brieuc relics back to the town from Angers in October 1210.Work on the building's west façade continued under the bishopric of Monseigneur Guillaume Pinchon from his arrival in 1220 to his exile to Poitiers in 1228 following Pinchon's conflict with Pierre Mauclerc.