FTP, name this 13th-century Scottish philosopher, whose followers eventually became known as "dunces."
He gained notoriety by lecturing on the Sentences of Peter Lombard, but had to quit teaching after he was exiled for refusing to support Philip IV against Pope Boniface VIII.  His notable writings include Questions on Metaphysics, On the First Principle, and Quodlibetic Questions.  Because of his skillful and intricate defense of the Immaculate Conception, he earned the nickname of Doctor Subtilis, but his name is now not associated with intelligence.  FTP, name this 13th-century Scottish philosopher, whose followers eventually became known as "dunces."
He gained notoriety by lecturing on the Sentences of Peter Lombard, but had to quit teaching after he was exiled for refusing to support Philip IV against Pope Boniface VIII.  
John Duns Scotus or Johannes Scotus Erigena