Triumphal Arch Mosaic: Center Detail
Detail of 5th-century mosaic in the center of the triumphal arch: a circle containing the apocalyptic throne of Christ with the Book of the Seven Seals, flanked by Sts. Peter and Paul and the symbols of the Four Evangelists. At the bottom is the inscription: XYSTUS EPISCOPUS PLEBI DEI, "Sixtus the Bishop to the people of God." Apologies for the terrible quality - we didn't have a zoom lens when we visited, so this is cropped from a larger photo.
Credit: Holly Hayes