This book deals with more than political philosophy in medieval Islam. The Islamic community was a religio-political unity, and as a consequence Islamic thought drew no clearcut distinction between what was strictly religious and what was political or legal. This makes it impossible to study its political ideas without delving into its thought in general and the evolution of its institutions and legal systems. This delving Mr. Rosenthal has done well, and by doing so he has produced a book which not only outlines the political philosophy of Islam ... but gives us also an idea of its general thought and the development of its principal institutions. - American Historical Review