Columbia subject headings:
Harvard subject headings:
Byzantine Empire--Civilization--527-1081.
Byzantine Empire--Relations--Holy Roman Empire.
Holy Roman Empire--Civilization--Byzantine influences.
Holy Roman Empire--Relations--Byzantine Empire.
Liudprand, Bishop of Cremona, -approximately 972.
Princeton subject headings:
Civilization, Medieval.
Liudprand, Bishop of Cremona, -approximately 972.