Mahdi's book marks a watershed in scholarship on medieval political philosophy. For the specialist, chapter 5, on the Book of Religion, alone would be worth the price of the book as a whole. The same could be said for the most synoptic chapter, chapter 7. For the more general reader and, especially, the teacher of political philosophy, the introductory section of the book will prove to be an indispensable resource. Introductions to medieval Islamic philosophy have appeared in great profusion in recent years. Part One of this book constitutes the best introduction to medieval Islamic political philosophy and may do the same for Islamic philosophy as a whole. Until now, no one has explained sufficiently why the first truly great efflorescence of philosophy within the Islamic world should be so deeply political. The peculiar character of this founding of medieval Islamic (political) philosophy has much to do with the relative inattention to Alfarabi in Western scholarship, despite his towering role in medieval Islamic and Jewish thought. With this book, we have reason to hope that Alfarabi will begin to garner the attention he deserves.