Aristotle: Circle 1, Inferno 4   "The master of those who know" (Inf. 4.131). So respected and well known was Aristotle in the Middle Ages that this phrase is enough to identify him as the one upon whom other prominent philosophers in Limbo-- including Socrates and Plato--look with honor. Dante elsewhere follows medieval tradition by referring to Aristotle simply as "the Philosopher," with no need of additional information. Aristotle's authority in the Middle Ages owes to the fact that almost all his works were translated into Latin (from their original Greek and / or from Arabic) in the twelfth and thirteenth centuries. By contrast, only one work by Plato--the Timaeus--was available in Latin translation (partial at that) in Dante's day. A student of Plato's, tutor to Alexander the Great, and founder of his own philosophical school, Aristotle (384-322 B.C.E.) wrote highly influential works on an astonishing range of subjects, including the physical universe, biology, politics, rhetoric, logic, natural philosophy, metaphysics, and ethics. Next to the Bible, he was the most important authority for two of Dante's favorite Christian thinkers, Albert the Great and his student Thomas Aquinas, both of whom strove to validate the role of reason and to sharpen its relationship to faith. The influence of Aristotelian thought on Dante is perhaps most apparent in the content of a philosophical work (Convivio), the argumentation of a political treatise (De Monarchia), and the moral structure of hell (Inferno).