The sixth-century theological controversy over the ‘Three Chapters’, which centred on the nature of Christ, provoked one of the most serious and long-lived religious schisms of the early Middle Ages. The fault lines ran not only between the Byzantine imperial court and the papacy, but between Rome and the churches in the former western empire’s successor states. In Italy, the schism endured into the seventh century, and the repercussions were felt long thereafter. Though rooted in the complexities of christological debate, the tensions reveal the growing political as well as cultural divide between Byzantium, Rome, and the West. Thus the controversy is critical for our understanding of the late-antique and early-medieval Mediterranean world, and of the inheritance of empire in western Europe and North Africa. This book presents ten chapters by an international group of scholars who examine different facets of the Three Chapters Controversy and its profound impact on these regions.