This Bell Tower has a remarkable base dating back to the Romanesque age, probably built around the eleventh century, with shafts of columns of different kinds with classical and Byzantine capitals, statue bases and every sort of marble fragments. In the two strikingly heightened, arcades and in the columns arranged on the edges, it reveals its evident Byzantine character. This building is interesting also for the town-planning history, since the short heightened arches rooms and the next vault on via Pietà, at the entrance of the Bishop’s Palace, for a long time were used for public meetings before they took place inside the castle. The upper part of the Bell Tower was probably reduced to its present shape around the sixteenth century.