 Parts of Jesus (crown of thorns, four nails, and perizoma) are covered in metal.The apse has four sculptures that stand inside wall niches, including Saint Jacob, John the Baptist, and resurrected Christ.The ceiling of the apse is decorated with three stucco reliefs depicting the conversion of Paul the Apostle, calling of Saint Peter, and handing over of the keys of Heaven and papal tiara to Peter by Christ.