The Council of Constantinople of 869-70 was highly dramatic, with its trial and condemnation of Patriarch Photius, a towering figure in the Byzantium of his day, and the tussle of wills at the council between the papal legates, the imperial representatives and the bishops. It was church politics and personalities rather than issues of doctrine, such as icon veneration, that dominated the debates. Out of all the acts of the great early councils,...