- For other figures with this name, see Gratian (disambiguation).
Since the 11th century, Bologna had been the centre of the study of canon law, as well as of civil law, after the Corpus Juris Civilis was rediscovered in western Europe. Little is known about Gratian's life. For a long time he was believed to have been born at the end of the 11th century, at Chiusi in Tuscany. He was said to have become a monk at Camaldoli and then he taught at the monastery of St. Felix in Bologna and devoted his life to studying canon law. Recent research has found no foundation for this view.
His compilation, the Concordia discordantium canonum (Concord of Discordant Canons), later simply named the Decretum, was an attempt, using early scholastic method, to solve seemingly contradictory canons from previous centuries. Gratian quoted a great number of authorities, including the Bible, papal and conciliar legislation, church fathers such as Augustine of Hippo, and secular law in his efforts to reconcile the canons. The vulgate version of Gratian's collection was completed at some point after the Second Lateran Council, which it quotes. Research by Anders Winroth, The Making of Gratian's Decretum , has shown that some manuscripts have survived of an early version of Gratian's text, which differs considerably from the mainstream textual tradition.
With later commentaries and supplements, the work was incorporated into the so-called Corpus Iuris Canonici. The Decretum quickly became the standard text book for students of canon law throughout Europe, but it never received any formal official recognition by the papacy. Only the Codex Iuris Canonici of 1917 put it out of use.
- Crompton, Louis (2006). Homosexuality & Civilization. Harvard University Press. ISBN 9780674022331. http://books.google.com/books?id=TfBYd9xVaXcC.
- Noonan, John T. (1979). "Gratian Slept Here: The Changing Identity of the Father of the Systematic Study of Canon Law". Traditio 35: 145–172.
- Winroth, Anders (2000). The making of Gratian's Decretum. Cambridge University Press. ISBN 9780521632645. http://books.google.com/books?id=V1Jg61NZ6vAC.
- Domus Gratiani, the website of Anders Winroth, Yale University
- "Johannes Gratian". Catholic Encyclopedia. New York: Robert Appleton Company. 1913. http://en.wikisource.org/wiki/Catholic_Encyclopedia_(1913)/Johannes_Gratian. ko:볼로냐의 그라티아누스