Choirboys were taught in this house, hence its name, up until the 19th century. The building itself dates from the 15th century. Situated to the southeast of the cathedral, this old chapter house is today part of the sacristy. Restored after a fire in 1972, the building maintains its medieval character with a magnificent polygonal tower and a small corner turret typical of residential architecture at the end of the Middle Ages. Don't overlook the turret pinnacles, balustrades and crockets illustrating the various stages of life. The little garden hidden away between the Cours Saint-Pierre and Impasse Saint-Laurant is a good spot for a moment's peace.