Originally built in the 4th century, the Aula Palatina has been remade several times according to the aesthetics of each age that transformed it.
Alfred Frazer, “The Imperial Realm: Architecture,” Age of Spirituality: Late Antique and Early Christian Art, Third to Seventh Century, edited by Kurt Weitzmann (New York: The Metropolitan Museum of Art, 1979), pp. 109–23.
Richard Krautheimer, “The Constantinian Basilica,” Dumbarton Oaks Papers, volume 21 (1967), pp. 115–40.
Noel Lenski, “Building Churches,” Constantine and the Cities: Imperial Authority and Civic Politics (Philadelphia: University of Pennsylvania Press, 2016), pp. 179–96.