Clelia V. Crialesi received her PhD in 2019 from the University of Rome “Tor Vergata” –“Roma Tre” and the École Pratique des Hautes Études (EPHE) Paris with a dissertation entitled “L’aritmetismo teologico dei secoli X e XI: Abbone di Fleury e l’Explanatio in Calculo Victorii.” Her most recent publication is “Le opera dei sei giorni: aritmetica ed esegesi secundum physicam in Teodorico di Chartres,” Medioevo. Rivista di storia della filosofia medievale XLI (2017): 67-102. As a Mellon Fellow, Dr. Crialesi will research the development of arthimetical teaching and learning stimulated by the transmission and reception of Boethius’ de arithemetica in the high Middle Ages. A second aspect of the project foresees the preparation of a critical edition of a lemmatic commentary found in an eleventh century codex, Firenze, Biblioteca Mediecea Laurenziana, Plut. 51, 14 that will assist in establishing a chronology for the reception of the De arithmetica from the time of John Scotus Eriugena and the commentary by Thierry of Chartres.