This majestic building surrounded by blind arcades, in a Pisan Romanesque style. Its façade and present-day look is attributed to Giovanni Pisano (1287). Its beautiful campanile surmounted by four pinnacles has windows inset. The façade is decorated with roaring lions, capitals delicately carved and the central lintel is adorned with depictions of the life of Saint Cerbone. Inside are various capitals in the nave and a Virgin of the Graces attributed to Duccio di Buoninsegna.