Among the medieval works that avoided destruction during the fire of 1595 are the fresco of the Madonna with Child in the triumphal arch by the Pisan artist Maestro di San Torpè, as well as the cosmati pavement, work rarely found outside of Lazio. It was made using inlaid marble to create geometric patterns (mid-12th century). Other fresco fragments from the late medieval period have survived, among which is "Saint Jerome" on one of the four central pylons, as well as "Saint John the Bapstist", a Crucifixion, and Saints Cosmas and Damian on one of the pylons near the entrance, partially hidden by the entry way.