PT Journal AU Varga, J TI Walter Burley's Theory of Truth in his Late Commentaries on Aristotle's Categories and On Interpretation SO Aither PY 2017 BP 58 EP 79 VL 9 IS 2 DI 10.5507/aither.2017.008 AB Late medieval philosopher Walter Burley (ca. 1275-1344) briefly treated his theory of truth in two different forms. The early version of his theory was presented in so-called "middle commentary" of Aristotle's On Interpretation. In this text Doctor planus et perspicuus defines the truth - in a logical sense - as an adequacy (adaequatio) of a "subjective" mental proposition (i.e. proposition composed out of concepts) with a propositional complex of things known as a real proposition (propositio in re), However, in his late commentary on the same Aristotle's work, compiled in 1337,Burley did not take real propositions into consideration at all. The goal of this study is to provide a reconstruction of Burley's late theory of propositional truth. The first part focuses on his concept of the propositional truth without the notion of a real proposition. The second part deals with some specific issues introduced in Burley's late commentary on Aristotle's Categories, Here Doctor planus et perspicuus also employed the concept of real proposition, nevertheless, he has significantly changed its function. ER