One of the seraphs that adorn the ceiling.
The Virgin and Child, on the half dome of the apse. Though they appear small, the figures are about sixteen feet high.
10th century mosaic of the Virgin and Child, sided by Constantine and Justinian.
The Deesis mosaic, from the 13th century. Christ is at the center; Saint John the Baptist and the Virgin Mary are by his side.
Detail of the Deesis