This church was raised to the category of basilica in 1983.
It was built in the 13th century, joined to the defensive wall, although it was completed with several different works through to the 15th century. The Gothic church has one nave with side chapels. The doorway is from the 16th and 17th centuries. The choir stalls are Baroque and date from the 18th century. The cloister is Gothic and at one corner is the 15th-century Chapter House. The Cathedral Museum is in the upper cloister, with access via an 18th-century staircase. It is home to an Italian relief in Carrara marble, attributed to Donatello.