 Aristotelian texts set the groundwork for discussions of the logic of knowledge and belief, particularly De Sophisiticis Elenchis as well as the Prior and Posterior Analytics. While Aristotle addressed the four alethic modes of possibility, necessity, impossibility, and contingency, Buridan, Pseudo Scotus, Ockham, and Ralph Strode, helped to extend Aristotle’s insights to epistemic themes and problems (Boh 1993; Knuuttila 1993). During this period, the Pseudo-Scot and William of Ockham supplemented Aristotle’s study of mental acts of cognition and volition (see Boh 1993: 130). Ivan Boh’s studies of the history of fourteenth and fifteenth century investigations into epistemic logic provide a excellent coverage of the topic, especially his Epistemic Logic in the Later Middle Ages (1993).