Cesare Nebbia, from the Façade of the Duomo of Orvieto: The Apostles (left side)

1350-90
Mosaic
Façade of Orvieto Cathedral, Italy

This is the area left of the Assumption mosaic. The apostle with the keys would be St. Peter. The others are undifferentiated.

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