Abstract

In the third part of his Dialogus, William of Ockham briefly dealt with Marsilius of Padua’s theory of conciliar infallibility. By contrast, none of the contemporary papalist responses to the Defensor pacis discussed Marsilius’ antipapal conciliar programme. This paper attempts to shed light on the papalists’ silence by relating the Ockham–Marsilius debate to Guido Terreni’s theory of infallibility. On this basis, the text argues that the Franciscan theologian was far more detached from the mainstream of traditional late medieval ecclesiology than either Marsilius or his papalist opponents