At various times over the past millennium bishops of Rome have claimed a universal primacy of jurisdiction over all Christians and a superiority over civil authority. Reactions to these claims have shaped the modern world profoundly. Did the Roman bishop make such claims in the millennium prior to that? The essays in this volume from international experts in the field examine the bishop of Rome in late antiquity from the time of Constantine at the start of the fourth century to the death of Gregory the Great at the beginning of the seventh. These were important periods as Christianity...