This book describes the doctrine and impact of Alexander of Aphrodisias, the second-century commentator on Aristotle, through the centuries and up to his sixteenth-century role as the clandestine prompter of a new philosophy of nature. In the millennium after his death, Alexander first served the Neo-Platonic schools as their authority on Aristotle, and in the Arabic centuries subsequently served as Averroes' exemplary exponent of the doctrine of the mortality of the soul. For this reason, the Latin Scholastics deemed his work unworthy of being translated. This changed only in the late Middle...