Columbia subject headings:
Byzantine Empire--History--1081-1453.
Crusades.
Europe--History--476-1492.
Islamic Empire--History--1258-1517.
Islamic Empire--History--750-1258.
Latin Empire, 1204-1261.
Harvard subject headings:
Byzantine Empire--History--1081-1453
Christianity and other religions
Crusades
Europe--History--476-1492
Festschriften
Islam--Relations--Christianity
Islamic Empire--History--1258-1517
Islamic Empire--History--750-1258
Latin Empire, 1204-1261
Muslims--Middle East--History--To 1500.
Princeton subject headings:
Byzantine Empire--History--1081-1453.
Christianity and other religions.
Crusades.
Europe--History--476-1492.
Festschriften.
Islam--Relations--Christianity.
Islamic Empire--History--1258-1517.
Islamic Empire--History--750-1258.
Latin Empire, 1204-1261.
Muslims--Middle East--History--To 1500.