William of Ockham (c. 1287–1347) is among the most prominent figures in the history of philosophy during the Late Middle Ages along with Thomas Aquinas and John Duns Scotus. He is probably best known today for his espousal of metaphysical nominalism. Indeed, the principle known as “Ockham’s Razor” is named after him. But Ockham held important, often influential views not only in metaphysics but also in all other major areas of medieval philosophy—logic, physics or natural philosophy, theory of knowledge, ethics, and political philosophy—as well as in theology.