Columbia subject headings:
Christian art and symbolism--Medieval, 500-1500--Exhibitions.
Gregory I, Pope, approximately 540-604--Art--Exhibitions.
Harvard subject headings:
Christian art and symbolism--Medieval, 500-1500--Exhibitions
Gregory I, Pope, approximately 540-604--Art--Exhibitions.
Princeton subject headings:
Christian art and symbolism--Exhibitions.
Gregory I, Pope, approximately 540-604--Exhibitions.