Columbia subject headings:
Church history--Middle Ages, 600-1500--Congresses.
Crusades--Congresses.
Islamic Empire--History--750-1258--Congresses.
Palestine--History--638-1917--Congresses.
Saladin, Sultan of Egypt and Syria, 1137-1193--Congresses.
Harvard subject headings:
Church history--Middle Ages, 600-1500--Congresses.
Crusades--Congresses
Hattin, Battle of, Israel, 1187--Congresses.
Islamic Empire--History--750-1258--Congresses.
Palestine--History--638-1917--Congresses.
Saladin, Sultan of Egypt and Syria, 1137-1193--Congresses.
Princeton subject headings:
Church history--Middle Ages, 600-1500--Congresses.
Crusades--Congresses.
Islamic Empire--History--750-1258--Congresses.
Palestine--History--638-1917--Congresses.
Saladin, Sultan of Egypt and Syria, 1137-1193--Congresses.