  A third factor, the isomorphism between language, thought, and reality inherited from ancient discussions of Aristotle's view, prompted scholastic attempts to establish (some scholars use ‘derive’ or even ‘deduce’) the exact number of categories. Most popular among these was the effort to tie the categories to different kinds of predication, but there were authors who explored other possibilities, such as derivations based on the modes of being.  Although there are early hints at an attempt based on predication in Simplicius' Commentary on Aristotle's “Categories,” it was not until the middle of the thirteenth century that commentators typically raised a separate question concerning the number of categories, an issue often referred to as sufficientia praedicamentorum. Albertus Magnus (ca. 1200–1280), Simon of Faversham (ca. 1260–1306), Peter of Auvergne (d. 1304), Radulphus Brito (ca. 1270–1320), and Henry of Ghent (ca. 1217–93), among others, attempted to determine the number of categories. The most famous and influential of the authors who engaged in this exercise was Thomas Aquinas, who followed Albertus Magnus in trying to derive the categories from modes of predication. Simon of Faversham and Radulphus Brito, though, followed the tradition of deriving them from modes of being. Later thinkers, such as John Duns Scotus, doubted the possibility of such a demonstration, and William of Ockham and John Buridan (ca. 1300–1361), among others, went even further, rejecting the view that there are ten categories of reality, let alone the possibility of demonstrating that there are ten categories.