Huguccio (Hugh of Pisa; Italian Uguccione da Pisa) was an Italian canon lawyer (b. at Pisa, date unknown; d. in 1210). His major non-legal work is the Magnae Derivationes or Liber derivationum, dealing with etymologies, based on the earlier Derivationes of Osbernus of Gloucester.
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 supposed pupils was Lothario de' Conti, afterward 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).
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 the second part of the Causae of the Decretum of Gratian, Causae xxiii-xxvi, a gap which was filled by Johannes de Deo.
Huguccio argued, in a widely known opinion, that a pope who fell into heresy automatically lost his see, without the necessity of a formal judgment.
- Charles de Miramon, “Innocent III, Huguccio de Ferrare et Hubert de Pirovano: Droit canonique, théologie et philosophie à Bologne dans les années 1180,” in Medieval Church Law and the Origins of the Western Legal Tradition. A Tribute to Kenneth Pennington, ed. Wolfgang P. Müller and Mary E. Sommar, Washington, D. C.: Catholic University of America Press, 2006, 320-346.
- Wilfried Hartmann and Kenneth Pennington, The history of medieval canon law in the classical period, 1140-1234, Washington, D. C.: Catholic University of America Press, 2008.
- Wolfgang Müller, Huguccio, the life, works, and thought of a twelfth-century jurist, Washington, D. C.: Catholic University of America Press, 1994.
- See Darko Senekovic, "Ugutius "Magnae derivationes" - über den Erfolg einer lexikographischen Sprachphilosophie," In: Archivum latinitatis medii aevi 64 (2006), pp. 245-252.
- "Huguccio". Catholic Encyclopedia. New York: Robert Appleton Company. 1913.
- For an excerpt from this text with an English translation, see .
- For a recent edition, see Huguccio Pisanus, Summa Decretorum, I: Distinctiones I-XX, ed. O. Přerovský, Vatican City 2006.
- See the text from Huguccio's Summa printed in Appendix 1 of Brian Tierney, Foundations of the Conciliar Theory, Cambridge: Cambridge University Press, 1955).