In the "Capitulary" of Charlemagne, compiled ca. In 823, Dungal was mentioned in a capitulary of Lothair. A capitulary of 802 gives insight into their duties. On 14 June 877, Charles issued the famous Capitulary of Quierzy. The "Notitia" is "essentially a forerunner of the Carolingian capitulary". The cathedral's Capitulary Library contains valuable manuscripts. He was the last ruler to issue a capitulary in the Carolingian tradition. Its capitulary room is of the baroque style. The manuscript is housed in the Capitulary Library of Vercelli, in northern Italy.