Columbia subject headings:
Harvard subject headings:
Charlemagne, Emperor, 742-814--Art--Exhibitions.
Charlemagne, Emperor, 742-814--Exhibitions.
Holy Roman Empire--History--To 1517--Exhibitions.
Holy Roman Empire--Kings and rulers--Biography--Exhibitions.
Kings and rulers in art--Exhibitions.
Princeton subject headings:
Charlemagne, Emperor, 742-814--Exhibitions.