Columbia subject headings:
Crusades--Seventh, 1248-1250.
Louis IX, King of France, 1214-1270.
Harvard subject headings:
Crusades--Seventh, 1248-1250
Louis IX, King of France, 1214-1270
Princeton subject headings:
Crusades--Seventh, 1248-1250.
Louis IX, King of France, 1214-1270.