English: Apse mosaic in the Church of San Marco, Rome, Italy. Commissioned by Pope Gregory IV between 829 and 831 during a rebuilding campaign of the church.
From left to right: Pope Gregory IV, holding a small model of the rebuilt church; Mark the Evangelist; and St. Felicissimus, a deacon martyr during the time of Pope Sixtus II. At the center is Jesus Christ, flanked by Pope Mark (died 336); St. Agapetus, another deacon martyr from the time of Pope Sixtus II; and St. Agnes.
Date
829–831
References
Bolgia, Claudia. "The Mosaics of Gregory IV at S. Marco, Rome: Papal Response to Venice, Byzantium, and the Carolingians". Speculum81 (1): 1–34. The University of Chicago Press.
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