Advanced bachelor studies and regency (1321 to 1332). We have the least amount of hard biographical data for this period, although it is clearly the most interesting and intense intellectual period of his life. Textual evidence allows us to argue with varying degrees of certainty that four of his five extant works – Reportatio, Lectura (which includes the separately edited Collatio et Prologus), Quodlibet, De paupertate evangelica, and Sermo de visione beatifica – were written during this period.[2] We have long possessed reasonable dates (although they are wide, in one case) for the first two of these works: he probably delivered his Reportatio lectures during the academic biennium 1321–23, and his Lectura must have been written between 1324 and 1330.[3] The first three works listed above are of primary philosophical importance in his corpus. During this period Chatton delivered an important set of lectures in which Ockham’s thought is strenuously criticized (probably in London), completed his training at Oxford, and attained the final academic rank marking that achievement, regent master, in academic year 1329–1330.[4]