Of the Romanesque building, which was partially destroyed in 1298 and 1444, the arcades of the north aisle of the nave remain (the Gothic-style south aisle dates from 1496) and above all the beautiful bell tower covered with a gambrel roof pierced by three storeys of small semi-circular bays (1st half of 12th century). A 12th-century Romanesque sarcophagus, decorated with a series of six arcatures and a grape frieze, placed in a Romanesque coffin can be seen in the lapidarium.