John Duns Scotus was a prominent Scottish Franciscan friar, theologian, and philosopher who lived from approximately 1265 to 1308. A highly influential figure in late medieval Western Christendom, he taught at prestigious institutions such as the University of Oxford and the University of Paris. Known for his penetrating intellect, he earned the nickname Doctor Subtilis (the subtle Doctor). His extensive academic contributions, particularly his commentaries on the works of Peter Lombard, established a distinct intellectual tradition known as Scotism.