 The last approach to the categories, namely the Medieval derivational approach, goes some way in the direction suggested but not taken by Moravscik’s Modal Approach. There is a rich tradition of commentators including Radulphus Brito, Albert the Great, Thomas Aquinas, and most recently their modern heir Franz Brentano, who provide precisely the kind of derivation for Aristotle’s categorial scheme found wanting by Kant. According to the commentators in this tradition, Aristotle’s highest kinds are capable of a systematic and arguably entirely a priori derivation. The following quotation from Brentano captures nicely the philosophical import of such derivations.