Nicene Christians, which had tormented the western empire during the barbarian invasions of the fifth century, had been complicated by another dispute, between Chalcedonians and Miaphysites, who disagreed over the exact nature of Christ and the balance between his human and divine qualities.17 Today the issues at stake between these two groups can seem arcane to all but specialist church historians. But in the sixth century they were enough to cause popular riots and international diplomatic crises. Bishops had been murdered by mobs for professing views at odds with their congregations’; a
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