Conciliar infallibility is just as firmly entrenched in Christian and “Roman” (also Orthodox) Tradition as papal infallibility. Thus, the Second Council of Constantinople (553) anathematized and condemned those who dissented from the definitions of the first four ecumenical councils, which “we follow and accept through all things and in all things” (Denzinger, 212). The Lateran Council of 649, in its Canon 17, applies the same teaching to the first five councils (“all even to the last portion that has been... Read more