Girolamo dai Libri, Initial M with David in Prayer
Tempera, gold, and ink on parchment
Metropolitan Museum of Art, 12.56.3
The text is the beginning of Psalm 51, Miserere mei Deus ("Have mercy on me O God").
Read more about King David.
Photographed at the Metropolitan by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.