The center of the upper register depicts Christ as Pantocrator (Ruler of All), in a traditional Byzantine style. The background is dark blue with golden stars and is bounded by a pale blue circle or tondo, which represents the entire Universe. He sits on a scarlet cushion on a richly decorated throne and holds a book, which displays the text:
Ego sum lux mundi, qui...
(I am the light of the world who [takes away the sins of the world]).