IN the early 1520s, the doctors and masters of the University of Oxford—like their peers in Paris, Louvain, Cologne, and elsewhere-faced a profound threat in the emergence of the Lutheran heresy. It is hard to exaggerate the problems of heresy for early sixteenth century mentalities. Heresy was, of course, an ‘iniquitous disease’ which could infect the mind of the Church and endanger the souls of all Christians. Popular heresies were a political menace which easily fomented rebellion. They could coalesce social and economic tensions into open attacks on the traditional order. But a learned heresy, as Luther’s at least in part certainly was, posed a particular challenge to the universities. While it is true that the academies had produced more than a few heretics themselves, one of the principal purposes of the universities (and especially their theology faculties) was to refute errors when they were heard, to proclaim orthodoxy anew, to train thinkers and preachers to oppose the heretics: in short, to fulfill their claims (made increasingly often during the later Middle Ages) to act, on the basis of their expertise, as religious authorities.