Saint John the Evangelist

6th century
Church of San Vitale, Ravenna, Italy

This is one of the portraits in the triumphal arch. Because the person is pictured as young and beardless, tbe inscription IOHANNIS ("John") surely refers to St. John the Evangelist, not St. John the Baptist.

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Photographed at the site by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.