Located on the first floor of the Annonciade chapel, the Salle du Chapitre is a square-plan room covered by a brick dome. This generates a curious acoustic phenomenon of sound propagation from one corner to the other, which you can experience for yourself.

The Treasure brings together remarkable works from the Carolingian to the modern period: an ivory evangeliary plaque carved in the 9th century, an 11th-century Hispano-Moorish pyxis, the illuminated pontifical of Archbishop Pierre de la Jugie, the fascinating tapestry of the Creation (Flanders, circa 1500), and other liturgical objects testifying to the magnificence of the archbishops of Narbonne.