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Zabarella consulted newly recovered Greek commentators such as Alexander of Aphrodisias, Philoponus, Simplicius and Themistius, as well as medieval commentators like Thomas Aquinas, Walter Burley and Averroes.
There are in fact more than thirty books from the 16th century which are all about the Aristotelian Philosophy and its classic commentators such as Averroes, Alexander of Aphrodisias, Theodorus Gaza, Saint Thomas, averroistic books by Agostino Nifo and Marcantonio Zimara and Crisostomo Iavelli, mentioned by Tommaso Campanella himself in his Philosophia sensibus demonstrata and interesting it is that some of those books contain also annotations from original authors.
As time went on, the commentary On the Soul by Alexander of Aphrodisias was translated into Latin, by Girolamo Donato, and a translation of the commentary attributed to Simplicius was also circulated.
Other important philosophers and thinkers in the Sicilian Questions referred to are, in alphabetical order, Alexander of Aphrodisias, Anaxagoras, Berosus, Crates, Diogenes, Euclid, Al-Farabi, Galen, Al-Ghazali, Al-Hallaj, Ibn Bajja (Avempace) Ibn Sina (Avicenna), Iamblichus, Mellow, Parmenides, Pythagoras, Plato, Socrates, Themistius, Theophrastus, and Zeno of Elea.