Columbia subject headings:
Harvard subject headings:
Byzantine Empire--History--1081-1453.
Byzantine Empire--History--527-1081.
Byzantine Empire--Relations--Europe.
Crusades--Public opinion.
Europe--Relations--Byzantine Empire.
Public opinion--Byzantine Empire.
Princeton subject headings:
Byzantine Empire--History--1081-1453.
Byzantine Empire--History--527-1081.
Byzantine Empire--Relations--Europe.
Crusades--Public opinion.
Europe--Relations--Byzantine Empire.
Public opinion--Byzantine Empire.