Fra Angelico, St. Peter Martyr Enjoining Silence
Convent of San Marco, Florence, Italy
Apparently friars in convents need to be shushed too, not just kids in libraries. St. Peter Martyr is identified by the knife in his back and the gash in his skull, received when he was murdered by "a man of the heretics" in 1252. As in other Fra Angelico frescos in the convent, his Dominican habit is blue and white, not the usual black and white. The book and palm branch in his left hand are also seen in many of his portraits. His fame is not as a writer, so the book is most likely intended as a sign of his orthodoxy.
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Photographed at the site by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.