 The commentary on Ibn Sīnā challenges the usual conception of a rivalry between the two great Islamic philosophers. He says that he chose to comment on Ibn Sīnā’s Poem because it is “better than many of the introductions written in medicine” (CommIbnSīnā 40). Even so, during the last decade of Ibn Rushd’s life, it is Galen who becomes one of his principal authorities. Still, Galen is often a target of criticism. In al-Kulliyyāt, for example, a work that he repeatedly revised (Gätje 1986), the revisions often move in a direction that is increasingly critical of Galen (Kulliyyāt II.162, II.184, etc.).