 Walter Burley is the author of the oldest treatise on consequence with known authorship (edited by Brown in 1980), but it is in his later work De Puritate, longer version, that one finds his fully developed theory of consequence (Archambault 2018b). The shorter version of De Puritate is thought to have been composed before Ockham’s Summa Logicae, and contains only a section on consequence and a section on syncategoremata. The received view is that, after becoming acquainted with Ockham’s Summa Logicae, Burley abandoned the text of what is now known as the shorter version of De Puritate and began to work on a new draft, which was to become the longer version (Spade 2000). The theory of consequence presented in the shorter version is based on ten basic principles, four of which are clearly sentential/propositional, while the other six take terms as the basic logical unit (Boh 1982). The only distinction of consequence that Burley discusses is that between simple and as-of-now consequence, a traditional distinction which remained popular in the 14th century: