The Apse in St. Paul Outside the Walls: Detail, St. Andrew
St. Andrew is identified by his wild hair, pointy beard, and the inscription to his left: S[AN]C[TU]S ANDREAS. His scroll reads, BEATVS ANDREAS DV[M] PENDERET IN CRUCE DE PRECABATUR D[OMI]NV[M] IESV[M] C[H]R[I]ST[UM], "Blessed Andrew when he hangs on the cross prayed to the Lord Jesus Christ."
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Photographed at the basilica by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.