He studied at Bologna, probably under Gandolphus, and taught canon law in the same city, perhaps in the school connected with the monastery of SS. Nabore e Felice. In 1190 he became Bishop of Ferrara.
Among his pupils was Lothario de' Conti, afterwards 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).
He wrote a "Summa" on the "Decretum" of Gratian, concluded according to some in 1187, according to others after 1190, the most extensive and perhaps the most authoritative commentary of that time. He omits, however, in the commentary on the second part of the "Decretum" of Gratian, Causae xxiii-xxvi, a gap which was filled by Joannes de Deo.
The Monarchia Controversy:An Historical Study with Accompanying Translations of Dante Alighieri's Monarchia, Guido Vernani's Refutation of the "Monarchia" Composed by Dante, and Pope John XXII's Bull Si Fratrum
Oct 01, 2004; The Monarchia Controversy:An Historical Study with Accompanying Translations of Dante Alighieri's Monarchia, Guido Vernani's...