Dedicated to Saints Fermo and Rustico, early 6th century martyrs, the basilica was given to the Benedictines in the 10th century and completely rebuilt in Cluniac style, with three naves and apsidal transept, in the period 1065-1143.The modern bronze door by Luciano Minguzzi (1984-88) was fitted in 1997. Inside, as well as the wood ceiling in the form of a keel, there are frescoes by Altichiero, Turone, Martino and Stefano da Verona, and also the Brenzoni funeral monument, with its splendid Annunciation by Pisanello (1424-26).