<P>Despite the enormous literature on the crusades, the Frankish states in the Aegean (set up in the wake of the Fourth Crusade in 1204) have been seriously neglected by modern historians. Yet their history is both compelling in itself - these were the last crusader states to be set up in the eastern Mediterranean and among the last to fall to the Turks - and also valuable for the case study they offer in medieval colonialism. Peter Lock surveys the social, economic, religious and cultural aspects of the region within a broad political framework, and explores the clash of cultures between the Frankish interlopers and their Byzantine subjects. This is a major addition to crusading studies.</P>