The museum entrance is situated in the arcaded courtyard on the north side of the cathedral, known as the chiostrino dei morti (cloister of the dead) or cimiterino (little cemetery) from its use as a burial site for many centuries. In 1729 this medieval structure was rebuilt in baroque style although the perimeter walls were left intact. The frescoes, also baroque, were executed by Antonio Maria Ruggeri and Francesco Bianchi (ceiling; 1732) and Andrea Porta (east wall). On the altar is an 18^th-century wood figure of the Madonna of the Seven sorrows. Displayed in the cloister are three fragments of Carolingian slabs decorated with an interlacing pattern which may originate from the chancel wall in the first basilica, and a marble mensa (altar top) from the medieval high altar. There are also two Roman sarcophagi: the 3^rd/4^th-century Sarcophagus of the Good Shepherd (after the carved figure on the front) and the 3^rd-century Sarcophagus of Audasia Calés (from the name of the child interred in it) decorated with winged genii and festoons. The rediscovery in the 14^th century of precious relics that had been placed in the sarcophagus in 1042 was to prompt the rebuilding campaign of the cathedral. The tomb slab of Ursina Castiglioni, a noblewoman from Monza who died in 1433, shows her lying on death bed, elegantly clad in medieval robes.