The Benedictine Abbey, initially dedicated to the Saints John and Benedict, was founded towards the end of the 10th century and Firmano, a monk from Acquacanina, was its first abbot in 986. The church was rebuilt in 1256 after having been almost entirely destroyed, following the plans of the previous structure featuring three aisles with apses divided by pillars. The structure is of medium dimensions and is entirely built in brickwork. It has a sobre gabled facade with a stone doorway, a low-relief of the Crucifixion in the fanlight, and the 17th century window.
The interior, with its essential architectural design, is notable for its significantly raised presbytery which is reached by an imposing stairway. The crypt houses a 15th century polychromatic terracotta statue of the Saint attributed to Della Robbia and presents many examples of the re-use of old materials from the Roman age.