Stanford Encyclopedia of Philosophy A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z Peter John Olivi Peter John Olivi must be considered one of the most original and interesting philosophers of the later Middle Ages. Although not as clear and systematic as Thomas Aquinas, and not as brilliantly analytical as John Duns Scotus, Olivi's ideas ...