John Duns Scotus was a Scottish Catholic priest and Franciscan friar, university professor, philosopher and theologian. He is considered among the most important philosopher-theologians in Western Christendom during the last part of the medieval period, together with Thomas Aquinas, Bonaventure and William of Ockham. The intellectual tradition derived from Scotus's work is called Scotism. 1265 – November 16, 1308; died at about 43. Alive at the same time as Dante Alighieri, Marco Polo, Kublai Khan, William of Ockham, and Giotto. Wiki link