A church at this site has been documented since the 12th century, when it was part of a Cluniac monastery of the Benedictine order located on the pilgrimage route to Rome, the Via Francigena. The monastery has suffered a lot over the centuries; An inscription states that the monastery was destroyed in 1216. The brick church has three naves and the three apses end in a typical Romanesque semicircle. The monastery buildings are no longer preserved. There are no remains of a former bell tower that was still there in the 16th century. The church is dedicated to Saint Valerian, a bishop martyred by Genseric in Tunisia in 460. The relics of this pre-Schism Western saint were said to have been taken to Pavia and then to Robbio. The church was desecrated centuries ago and at times used as a warehouse or barracks. There is no interior decoration.
Source: Wikipedia