This paper deals with three references found in John Wyclif’s unpublished De scientia Dei to a certain Tractatus 13, whose title relates to the position it holds in the first book of Wyclif’s Summa de ente. They are puzzling references, since the first book of the Summa is made up barely of seven tracts. In this paper I argue that the three references are actually linking devices to the final section of the De ente praedicamentali. Moreover, I maintain that, at (...) the time of the compilation of his De scientia Dei, Wyclif conceived the first book of his Summa as containing thirteen tracts, the last seven of which later collected under a single item. This allows for a broader and more consistent account of the order and dating of the De scientia Dei and other Wyclif’s writings. (shrink)