  At the beginning of the thirteenth-century, works of Aristotle and his Islamic commentators previously unknown in the Latin West became available. Among these were four works on logic–Prior and Posterior Analytics, Topics, and Sophistical Refutations–that became known as the new logic (logica nova) (Zupko 2003, 45). Their study did not displace the study of the older ones (the old logic, or logica vetus), but rather helped to intensify and expand it, and resulted in an increase in both the number and the complexity of the commentaries written about Categories. In addition, works on metaphysics and natural philosophy, such as Aristotle's Metaphysics and Physics, as well as commentaries by Islamic authors on them, circulated widely. These works introduced a new context and terminology in the discussion of categories.