Triptych of the Madonnna and Child: Detail, St. John the Baptist
This is the traditional iconography for portraits of St. John the Baptist: the camel skin, the lamb on the book, and the vexillum proclaiming ecce agnus dei, "Behold the Lamb of God" (John 1:29).
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Photographed at the Poreč Basilica by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.