William Ockham is probably the most notorious and most widely misunderstood philosopher of the later Middle Ages. Accused by John Lutterell, the former chancellor of Oxford University, of teaching heretical doctrines, Ockham was summoned to Avignon by Pope John XXII and eventually lived under the protection of Louis of Bavaria. Yet, with Aquinas and Scotus, he remains among the three greatest philosophers of the period. This landmark book,...