 In his own treatise, Philosophia sensibus demonstrata, Campanella produced a systematic critique of the axioms of Aristotelian philosophy, bringing to light their limitations and incoherence on the physical, cosmological and metaphysical level, by drawing on Telesian principles integrated with notions deriving from other philosophies. Campanella had a secure knowledge of Aristotle’s works and those of his commentators and followers, whether ancient (Themistius, Alexander of Aphrodisias, Philoponus), medieval (Averroes was frequently cited alongside Thomas Aquinas and, above all, the “divine” Albertus Magnus) or contemporary (such as Agostino Nifo). He re-evaluated the Presocratic philosophers, who had been criticized by Aristotle, and was well acquainted with medical writers from Hippocrates and Galen to Pietro d’Abano, Jean Fernel and Vesalius. He had read the works of astronomers and of natural philosophers—Pliny the Elder’s Natural History played a role of primary importance for him. One of the authors most cited by Campanella, in close conjunction with the philosophy of Telesio, was Marsilio Ficino. He quoted in particular passages from Ficino’s commentaries on Plato (especially the Timaeus and Symposium) and on the Enneads of Plotinus.