Book excerpt: Law was central to the ancient Roman conception of themselves and their empire. Yet what happened to Roman law and the position it occupied ideologically during the turbulent years of the Iconoclast era, c.680-850, is seldom explored and little understood. This volume uses Roman law and canon law to chart the various responses to these changing times - especially the rise of Islam, from Justinian II's Christocentric monarchy to the Old Testament-inspired Isauriandynasty - and the transformation from the late antique Roman Empire to medieval Byzantium.