 If there is one thing that is known about Peter Auriol, it is that he was a “conceptualist.” Indeed, Auriol has often been viewed as a forerunner of William Ockham precisely on account of his conceptualism. What is probably the very first monograph ever devoted to Auriol (Dreiling 1913) deals with his conceptualism. Thus, understanding Auriol’s conceptualism is a good place to start when dealing with Auriol’s thought.