Liber Extra
Among his supposed pupils was Lotario de' Conti, afterwards Pope Innocent III, who held him in high esteem as is shown by the important cases which the pontiff submitted to him, traces of which still remain in the "Corpus Juris" (c. "Coram", 34, X, I, 29). Two letters addressed by Innocent III to Huguccio were inserted in the "Decretals of Gregory IX" (c. "Quanto", 7, X, IV, 19; c. "In quadam", 8, X,III,41). However, Innocent probably was not well acquainted with Huguccio's ideas on the Eucharist when he issued the decretal "Cum Marthae" (X 3.41.16).