It is made in Gothic-Lombard style of the twelfth century. On the facade there are two buttresses, a rosette, a cusp and some spheres, while rampant arches are on the sides. On the right hand there is still part of the porch. Inside, adorned with frescoes from the 15th and 16th centuries, the annexation of the city to the Kingdom of Sardinia was proclaimed. The median portal brings to the top a lunette with the relief of St. Francis stigmatized, and inside, on the right wall of the deambulatorio, a bas-relief executed by the workshop of Giovanni Antonio Amadeo around 1490. In the Basilica is buried patriot Giuseppe Manfredi, First President of the Senate of the Kingdom of Italy, who died in 1918.