A 10th-century Depiction
This ivory shows the Byzantine emperor Constantine VII Porphyrogenitus, r. 913-59, crowned by Christ.
A 10th-century Depiction
This mosaic is from the Hagia Sophia in Constantinople (today, Istanbul). The emperor is not identified in the inscriptions, so it might be intended to read as a broader statement on power and authority. You can read about this mosaic here.
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Medieval Islamic History 