 In his logic and epistemology, Marsilius followed the nominalist tradition of the fourteenth century as exemplified by William of Ockham and John Buridan. Yet Marsilius never qualified himself as a nominalist or follower of Ockham. He was an independent thinker who sometimes went back to the older tradition of the thirteenth century (e.g., in Peter of Spain), or advocated theories which were more in line with ordinary speech, as against the highly specialized views of his contemporaries. Marsilius employed logical methods and discussed logical and epistemological issues in almost all of his writings, including his commentary on the Sentences of Peter Lombard, which, in addition to his works specifically dedicated to logic, were also used as a source for late medieval and early modern treatises on logic.