Porphyry

Porphyry

The Introduction ("Isagoge") to the Categories of Aristotle, Written by the Greek scholar and neoplatonist Porphyry in the third century A.D., was translated into Latin by Boetius, and in this form was extensively used throughout the Middle Ages as a compendium of Aristotelian logic. As a philosopher Porphyry was chiefly important as the immediate successor of Plotinus in the neoplatonic school at Rome, but his "Isagoge" had extraordinary weight among the medieval logicians.