 Averroes (Ibn Rushd), who comes to be known as “the Commentator” in the Latin West because of his magisterial grasp of Aristotle, is another important influence on the medieval commentary tradition. He declares on numerous occasions that his aim in commenting on Aristotle is to explain the Aristotelian text, a task he adheres to faithfully and with great success even though he lacked any knowledge of Greek. He does not introduce non-Aristotelian material to explain Aristotle; he does not even, for example, make reference to Porphyry’s introduction to the Categories, the Isagoge, to help make sense of the Categories. He does, however, add to the Aristotelian text in two ways. First and most ubiquitously, he divides Aristotle’s text into sections and chapters, some of which follow the divisions we now have, some of which he devises himself. The origin of the modern textual divisions of Aristotle’s work is not known and those divisions are not authoritative. Averroes may have worked with a text that contained no divisions at all; thus he would have had to supply them all (Butterworth 1983, 6–8). Further, Averroes adds explanations of aspects of Aristotle’s text that are especially unclear or terse, and adds references to other works in the Aristotelian corpus to help explain particular texts. Averroes, like other ancient and medieval commentators, assumed that there was no significant change or development in Aristotle’s views over time and therefore that his different works are consistent with each other.