Marble panels like these were used throughout the Byzantine world as bases for templons as well as for low walls for the galleries of churches and beneath windows. Since they were widely exported, such panels are also found in Italian churches, especially in the region around Venice, where Byzantine sculpture was closely copied.
Luigi Grassi, Florence; [ Joseph Altounian, Maçon and Paris (sold 1938)]; [ Brummer Gallery, Paris and New York (1938–1947)]
Brenk, Beat. "Byzantinische Marmorschranken in amerikanischen Museen." Acta Ad Archaeologiam et Artium Historiam Pertinentia 8 (1978). p. 87, fig. III.
Evans, Helen C., and William D. Wixom, ed. The Glory of Byzantium: Art and Culture of the Middle Byzantine Era, A.D. 843–1261. New York: The Metropolitan Museum of Art, 1997. no. 3, p. 38.
Evans, Helen C., Melanie Holcomb, and Robert Hallman. "The Arts of Byzantium." The Metropolitan Museum of Art Bulletin, n.s., 58, no. 4 (Spring 2001). p. 43.