 This arsenal of sources was crucial for exposing George’s scarce knowledge of Aristotelian philosophy and tradition, and therefore the unreliability of his praise of the Stagirite’s alleged piety: this problem is the subject of the third book of the In calumniatorem Platonis, which was composed at a later stage, mainly relying on material provided by the Dominican theologian Giovanni Gatti (d. ante 1484). Finally, by defending the agreement between Plato and Aristotle, Bessarion could also avoid any association with Gemistus Pletho, whose ambiguous religious reputation could have tainted the Cardinal.