Epistemology, William of Ockham

There are several places in Duns Scotus' account where Skeptical challenges can gain a foothold, for example, when he endorses the certainty of sense knowledge and when he holds that intuitive cognition must be of an existent object. William of Ockham (c. 1285 - 1349?) took his stand against the Skeptical challenge by radically revising Duns Scotus' idea of intuitive cognition.