This research is aimed at reconstructing and studying the sections of Landulph Caracciolus's commentary on the Sentences dedicated to the principle of individuation. Landulph Caracciolus is a Franciscan friar coming from Naples who lived in the XIVth century and who lectured the Sentences at Paris in the academic year 1318-1319. Recently, Christopher D. Schabel has underlined that, despite its widespread popularity and the important context of its composition, however, Landulph's commentary on

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... he Sentences has largely been neglected. From 1999 Christopher D. Schabel and Russell L. Friedman have been promoting a larger attention to Landulph's commentary, showing that the Franciscan friar can be an interesting mean to trace the story of the reception of Duns Scotus and Peter Auriol's doctrines at the University of Paris during the first twenty years of the XIVth century. The question of the principle of the individuation is about the research of the existence and the identification of the element responsible for both ontological determination and knowledge of the single entity. The first chapter of this work shows that the question explodes during the XIIIth century thanks to the Aristotelian corpus and to Avicenna's and Averroes's works, and many thinkers try to offer a personal solution to the problem, offering six main competing theories: 1) real natures are individual as such (William of Ware); 2) double negation (Henry of Ghent); 3) actual existence (maybe Roger Bacon, Peter of Falco, Peter of Alverny or Robert Kilwardby); 4) the collection of personal accidents/properties (ascribed to Boethius), and particularly quantity (Godfrey of Fontaines and Thomas Sutton); 5) matter (Albert the Great, Thomas of Aquin and Giles of Rome); 6) respectus ad agens (unknown). In the XIVth century John Duns Scotus and Peter Auriol add their proposals. The Subtle Doctor gives a solution that is complex and rich of critical issues, due to the evolution of his theory for the principle of individuation (from forma individualis sup [...]