It was built in the eighth century by the Lombard King Desiderio. Afterwards, in the twelfth century it was rebuilt in Romanesque style.
On the simple fa├žade there is a nice Benedectine portal and at its sides you can see two bas-reliefs which represent King David on the left and Saint Vincenzo on the rigth.
On an ashlar, on the left of the portal, there is a famous magic square with an enigmatic inscription which says: ┬ôROTAS OPERA TENET AREPO SATOR┬ö. Scholars put forward many interpretations, but the most reliable one is the one that considers it as a cryptogram whose anagram forms the words Pater Noster plus letters A and O, that is to say the Alpha and Omega.
The interior of the church is composed of three naves and keeps a very fine ciborium (tabernacle) from the twelfh century. At the back of the ciborium there is a magnificent apsidal fresco representing the 24 old men of the Apocalypse and Jesus Christ on the throne among the Evangelists┬ĺ symbols.