Conciliarism is one of the oldest and most essential means of decision-making in the history of the Christian Church. Indeed, as a leading Orthodox theologian Alexander Schmemann states, 'Before we understand the place and the function of the council in the Church, we must, therefore, see the Church herself as a council.' Paul Valliere tells the story of councils and conciliar decision-making in the Christian Church from earliest times to the present. Drawing extensively upon the scholarship on conciliarism which has appeared in the last half-century, Valliere brings a broad ecumenical...