Bartolus lectured the Codex in the years 1342-1343 at Pisa or in the Studium of Perugia, where he had moved in the course of that year. Acknowledged as one of the greatest interpreter of the Corpus iuris of his time, his personality, «with his huge work as a thinker, even exceeds», as wrote Francesco Calasso «his stature, albeit major, as a lawmaker, and rightly holds his place among the humanly highest figures of the Italian Trecento, next to Dante, Giotto, and Catherine of Siena». The presented fragment of the Codex datable to the fourteenth century, which is now kept at the State Archives of Udine, comes from the registers and breviaturae of the notary Giacomo Miilini from San Daniele del Friuli (1579-83).