Abstract
This paper addresses the conception of theology developed by Giles of Rome from the Reportatio of his lecture on the second book of the Sentences to his fifth Quodlibet. It demonstrates that, from the beginning of his career, Giles discredited the power of philosophical reason in the realm of theology, a discipline which he conceived as a defensive, rhetorical and exegetical practice. Henry of Ghent was the principal adversary attacked by Giles, who challenged the scientific legitimacy of theology which Henry, after Thomas Aquinas, had established as the highest speculative discipline. In the conclusion, the paper highlights strong similarities between Giles’ theological epistemology and Godfrey of Fontaines’ conception and practices of university sciences.