Columbia subject headings:
Crusades--Fourth, 1202-1204.
Crusades--Seventh, 1248-1250.
Istanbul (Turkey)--History.
Latin Empire, 1204-1261.
Louis IX, King of France, 1214-1270.
Harvard subject headings:
Crusades--Fourth, 1202-1204
Crusades--Seventh, 1248-1250
Istanbul (Turkey)--History.
Latin Empire, 1204-1261.
Louis IX, King of France, 1214-1270
Princeton subject headings: