Santa Maria in Vallicella
The subject was to be St. Gregory the Great and important local saints adoring an icon of the Virgin and Child. The first version, a single canvas (now at the Musée des Beaux-Arts, Grenoble), was immediately replaced by a second version on three slate panels that permits the actual miraculous holy image of the "Santa Maria in Vallicella" to be revealed on important feast days by a removable copper cover, also painted by the artist.