Commentary on Averroes' Middle Commentaries on the Isagoge of Porphyry, the Categories and De Interpretatione of Aristotle Averroës (1126-1198) Translated into Hebrew by an anonymous member of the School of Gersonides LJS 229, Commentaries on Aristotle and Porphyry Title page Provence or Spain, between 1450 and 1499 Fifteenth-century copy of the fourteenth-century original Credit: Kislak Center, University of Pennsylvania (More bibliographic information)