Siege Warfare and Military Organization in the Successor States is the first study to comprehensively treat an aspect of Byzantine, Western, early Islamic, Slavic and Steppe military history within the framework of common descent from Roman military organization to 800 AD. This not only encompassed the army proper, but also a greater complex of client management, private military retinues, labor obligations and civilian conscription in urban defense that were systematically developed by the Romans around 400, and survived to be adopted and adapted by all successors.
The result was a common post-Roman military culture suitable for more restrained economic circumstances but still able to maintain, defend and attack city walls with skills rivalling those of their Roman forebears.
Alliances and Treaties between Frankish and Muslim Rulers Michael Köhler presents a fully integrated study of Frankish-Muslim diplomacy in the period from the First Crusade through to the thirteenth century. It is a ground-breaking study that challenges preconceived notions of the relations between Frankish and Muslim rulers in the Middle East. Commonly portrayed as an era of conflict, the period appears here as one in which conventions of diplomatic cooperation were commonplace. This book is one of the few works in the fields of Crusader Studies and Middle Eastern Studies that draws to the same extent on Arabic and Western sources; two textual traditions that have usually been studied in isolation from each other.