San Pietro in Ciel d'Oro, whose origins are to be found at the beginning of the 7th century by the monks of San Colombano. Rebuilt after the great earthquake of 1117, the modern building was consecrated in 1132.
The exterior is decorated with majolica tiles inside, murata the last pillar of the right aisle is the tomb of the Lombard king Liutprand. Also in the Church are preserved the relics of Sant ' Agostino, brought here by Liutprand from Sardinia. The relics of the Saint are preserved in the famous Ark of St. Augustine, whose marble mole is visible on the high altar.