1910
National Gallery of Art, 1571
National Gallery of Art, 1937
National Gallery of Art, 1850
National Gallery of Art, 1926
National Gallery of Art, 1837
National Gallery of Art, 1935
National Gallery of Art, 1473
National Gallery of Art, 1939
Rosenwald, Lessing Julius, 1622
Rosenwald, Lessing Julius, 1490
![The Mass of Saint Gregory [recto]](https://api.nga.gov/iiif/4d23fcb3-6c20-4387-b54f-a89d717bd134/full/843,/0/default.jpg)