 George’s translation of the Laws is the primary target of the fifth book, which contains a list of the errors—actual and alleged—made by Trebizond in his edition. The goal of this chapter is to prove George’s incompetence in Platonic philosophy, which in turn further proves the unreliability of his accusations against Plato. Yet, a peculiar concern with the translation of Platonic works runs throughout the entire In calumniatorem: Bessarion was aware that Latin Europeans’ scarce knowledge of Plato might have inclined them to listen to George of Trebizond. Bessarion’s practice of offering in his work translations of Platonic texts, accompanied by alternative exegeses to those offered by George—was intended to correct this knowledge gap in the Western world. Bessarion also presented to his Latin readers Aristotelian authors, such as Alexander of Aphrodisias, who had until then limited circulation in the Latin world, but whose interpretations of Aristotle placed the Stagirite in contradiction with Christian dogma. These insertions were part of Bessarion’s strategy for exposing the religious limits of Aristotelian philosophy, so providing implicit support for the notion that Plato could serve as a better external aid for true faith, in the tradition of the Church Fathers, and of Greek theologians such as Eusebius of Cesarea and Theodore Metochites.