Columbia subject headings:
Harvard subject headings:
Crusades--Fifth, 1218-1221
Crusades--Fourth, 1202-1204
Innocent III, Pope, 1160 or 1161-1216
Princeton subject headings:
Crusades--Fifth, 1218-1221.
Crusades--Fourth, 1202-1204.
Innocent III, Pope, 1160 or 1161-1216.