The museum exhibits an important artistic-liturgical apparatus dating from the Romanesque period to the 19th century, it includes decorative items, sculptures, antique relics, fabrics, paintings and manuscripts, which the Modena community used to embellish the domus Clari Geminiani over the centuries.
Amongst the oldest works, belonging to the Cathedral’s Treasure, is the precious San Geminiano altarolo (11th-12th century), the Evangelistario built in the scriptorium in Nonantola (late 11th – early 12th century), and characterized by a fine binding in silver and ivory, the Relatio, a text from the 13th century which is a copy of the original from the 12th century (it reports the news of the building of the Duomo) and the Stauroteca with a gold mounting from the 11th century, probably originating from Constantinople. A room has been dedicated to the Archivio Capitolare heritage, which contains the oldest collection of written documents regarding the Duomo. Herein is exhibited the privilege conceded by Charlemagne, along with its seal, and other manuscripts, some of them highly decorated (periodically they may be replaced by facsimile copies in order to guarantee an optimal conservation of the originals).
Special mention must be made of the two large Flemish tapestries with Tales of the Genesis, part of an exceptional cycle made of twenty pieces produced in the 16th century and used, until the end of the 60’s, to embellish the cathedral.