 Avempace commented very freely on the Aristotelian works and wrote independent articles on various subjects of personal interest. We are not always sure which source he read and whether it was the complete translation or an abridgment. In the case of his commentary on the  Meteorology,[18]  we know from Paul Lettinck’s edition and translation of the commentary. Lettinck proved that Avempace read the altered version of the Meteorology made by Yahyà Ibn al-Bitriq (d. ca. 830; Petraitis 1967).