What is the purpose of the Justinian mosaic in San Vitale?
This mosaic thus establishes the central position of the Emperor between the power of the church and the power of the imperial administration and military. Like the Roman Emperors of the past, Justinian has religious, administrative, and military authority.
What was the significance of Virgin and Child mosaic in the apse of Hagia Sophia?
The Theotokos mosaic of the Virgin and Child, in the central apse of the Hagia Sophia, is believed to reconstruct an earlier sixth century mosaic destroyed during Iconoclasm. It combines the Early Byzantine style with the new development of softer folds, increased modeling, and the addition of perspective .