# The Mass of Saint Gregory

- By: Master of Sir John Fastolf (French, active before about 1420 - about 1450)
- Date: about 1430–1440
- Medium: Tempera colors, gold leaf, and ink
- Classification: Folio
- Dimensions: Leaf: 12.1 × 9.2 cm (4 3/4 × 3 5/8 in.)
- Culture: French or English
- Credit line: The J. Paul Getty Museum, Los Angeles, Ms. 5, fol. 218v
- Museum: [J. Paul Getty Museum](https://www.getty.edu/art/collection/object/105TYW)
- Rights: [CC0. Digital image courtesy of Getty's Open Content Program](https://creativecommons.org/publicdomain/zero/1.0/)
- Picture: https://invisiblenetwork.ai/thumbs/web/a173e036e5f794bd3f02ea18041b0891.jpg
- Who can see it: Tweens profiles and older (museums give no ratings; placed by Invisible Network from the museum's own words)