Columbia subject headings:
Harvard subject headings:
Architecture, Medieval--Latin Orient.
Castles--Latin Orient.
Church buildings--Latin Orient.
Crusades.
Jerusalem--History--Latin Kingdom, 1099-1244.
Latin Orient--History.
Middle East--Antiquities
Military architecture--Latin Orient.
Princeton subject headings:
Architecture--Latin Orient.
Castles--Latin Orient.
Church buildings--Latin Orient.
Jerusalem--History--Latin Kingdom, 1099-1244.
Latin Orient--Antiquities.
Latin Orient--Description and travel.