Saint John the Evangelist
Oil on canvas, 54.7 x 39.4 in. (139 x 100 cm.)
Museo d'Arte Sacra, San Leo, Italy
Above the saint's left shoulder is his attribute, the eagle. On the low desk at his right knee are what may be writer's implements along with a scrap of paper. Sometimes devices such as the scrap are used for the name of the painter, but in this case I cannot make out any writing on it at all.
The image emphasizes the saint's work as a writing-down of phrases given him from above. As this detail photograph shows, the phrases are from the first chapter of John, which was recited at the end of every Mass until Vatican II:
Most other images of John writing the Book of Revelation make it clear that he is on an island, specifically Patmos. But here the landscape in the background is non-specific.
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Photographed at the museum by Claire Stracke, shared under Attribution-NonCommercial-ShareAlike license.