Cesare Nebbia, from the Fašade of the Duomo of Orvieto: The Apostles (right side)

1350-90
Mosaic
Façade of Orvieto Cathedral, Italy

The apostle with the sword would be St. Paul. The one with the palm branch and no beard could be St. John, although he is the one apostle not reputed to have been martyred. Also, there is one other beardless apostle in the group. The other four apostles are undifferentiated.

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View the Assumption mosaic with the apostles left and right
More of the apostles as a group

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