 Over the portal is depicted the Baptism of Jesus, assisted by Saint Peter, the Blessed Virgin Mary, Saint Zachary and Saint Paul.In the upper section is portrayed Theodelinda offering to John the Baptist the Iron Crown of Lombardy, together with her kneeling husband Agilulf and their children Adaloald and Gundeberga.The church has a nave and two aisles, separated by octagonal columns with Romanesque capitals and round columns with Baroque capitals.