In the first Critique, Kant raises two objections against Aristotle’s categories. Kant’s concern, in the first instance, is whether Aristotle generated all categories that there are and if he did not generate any spurious categories. However, for Kant, this is only a symptom of the second – deeper – flaw in Aristotle’s thinking. According to Kant, Aristotle generated his categories ‘on no common principle.’ This paper develops the two Kantian objections, offers an overview of Brentano's (1862. Von der Mannigfachen Bedeutung (...) des Seienden nach Aristoteles. Freiburg im Brisgau: Herder’sche Verlagshandlung.) reconstruction of Aristotle’s categories (which claims to have addressed them), develops three objections to this reconstruction, and recommends (Trendelenburg, A. 1846. Geschichte der Kategorienlehre. Berlin: Verlag von G. Bethge.) as a better – albeit still flawed – Aristotelian reply to Kant. (shrink)