Jacopo Palma il Vecchio, Saint John the Baptist
St. Barbara Altar
Church of Santa Maria Formosa
The saint can be identified by the animal-skin tunic (turned hair-side-in), the long cross, and the scroll (which in most similar images bears the words ECCE AGNUS DEI, "Behold the Lamb of God").
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Photographed at the church by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.