Book excerpt: This volume explores a complex period in Byzantine history, the thirteenth century, from the Fourth Crusade to the recapture of Constantinople by exiled leaders from Nicaea. Here, specialist historians of the Byzantine successor states of the period, and of their key neighbours, examine the self-projection and interactions of these states, combining military history and diplomacy, commercial and theological contacts, and the experiences and self-description of individuals. This wide-ranging series of articles uses a great diversity of sources - Arabic, Armenian, Bulgarian, Greek, Latin, Persian and Serbian - to exploit the potential of the novel methodology employed and of prosopography as an additional historical tool of analysis.