Michael Lofton examines the question of judging the pope for heresy. He begins by analyzing the case of St. Paul rebuking St. Peter. He then addresses the acts of the Fourth Council of Constantinople – along with its 21st canon. Lastly, he reviews older canons as well as the current code of canon law on judging the pope for heresy.

Can We Judge the Pope? A Brief History of Papal Criticism
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