  The position outlined above is developed in Autrecourt’s correspondence. It has led historians of philosophy to characterize him as the most important, if not the only, “real” representative of medieval scepticism, as “the medieval Hume”, to use Hastings Rashdall’s epithet. On closer inspection, however, it turns out that Autrecourt’s scepticism is reserved for rationalist claims about the truth of our commitments to causality and substance, concepts for which we have no empirical proof. It is now generally agreed that he is not a sceptic at all when it comes to defending the reliability of sense-perception.