The high altar itself was designed by Martino Longhi the Younger. On the entrance wall are frescoes by Gregorio and Mattia Preti, showing episodes from the Life of Saint Charles (1642).
Martino Longhi the Younger created the high altar. The entrance wall is adorned with frescoes by Gregorio and Mattia Preti, which depict scenes from the life of Saint Charles (1642).