Definition
John Duns Scotus (c. 1266-1308) was a Scottish philosopher and theologian, a prominent figure in medieval scholasticism. He earned the title "Doctor Subtilis" (Subtle Doctor) for his complex and nuanced arguments. Scotus explored metaphysics, logic, and ethics. His thinking diverged from Thomas Aquinas in important ways. He is known for his defense of the Immaculate Conception. Scotus is a monumental figure of scholastic thought.