Early bachelor of theology studies (1315 to 1321). During this period Chatton finished his early education and was sent south to Oxford to study theology. There he came in contact with William of Ockham who was lecturing at Oxford at this same time, although at a slightly more advanced career stage. Chatton began to oppose Ockham very early and very vocally, and this opposition was to last the entire duration of his Oxford career (i.e., into the early 1330s).