 It is still not possible to establish the date of origin of the Tractatus, the work that has enjoyed such enormous success. Recent scholarship suggests that it could have been written any time between the 1220s and the 1250s (Ebbessen 2013, 68–69). It has universally been recognised as a work by Peter of Spain. Another work that has been identified as Peter of Spain’s is a Syncategoreumata (Treatise on Syncategorematic Words), which was probably written some years after the  Tractatus.[2]  Considering the fact that in all the thirteenth-century manuscripts the Syncategoreumata directly follow the Tractatus, and the number of similarities between doctrinal aspects of these two works on logic, it is almost certain that they were written by the same author. Both works seem to have originated from Southern France or Northern Spain, the region where we also find the earliest commentaries on these treatises.