in addition to some of the recommendations already made. i'd try the histories of the military orders which give an insight into their role in crusades and the internal politics of the crusader states.
there are some interesting books, which give a history of the crusades from a greek perspective, an accessible (and very good) one being 'byzantium and the crusades' by jonathan harris.
there are some interesting books, which give a history of the crusades from a greek perspective, an accessible (and very good) one being 'byzantium and the crusades' by jonathan harris.

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