# The Mass of St. Gregory, from a Book of Hours

- By: Willem Vrelant (Netherlandish, flourished 1449-1481)
- Date: 1460/70
- Medium: Manuscript cutting in tempera and liquid gold on parchment
- Classification: Drawing and Watercolor
- Dimensions: 10.5 × 6.2 cm (4 3/16 × 2 1/2 in.)
- Culture: Netherlands
- Credit line: Gift of Mr. and Mrs. R. Stanley Johnson in honor of Anselmo Carini
- Museum: [Art Institute of Chicago](https://www.artic.edu/artworks/103419)
- Rights: [Public domain (CC0)](https://creativecommons.org/publicdomain/zero/1.0/)
- Picture: https://www.artic.edu/iiif/2/65430d24-f2ef-f0dd-a33a-c7c57598c36a/full/!1789,1080/0/default.jpg
- Who can see it: Teens profiles and older (museums give no ratings; placed by Invisible Network from the museum's own words)