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Historia
Very little is known about Johannes Gratian, who was born in Italy, possibly in Chiusi, Tuscany. He became a Camaldolese monk, and taught at Bologna. At a date some time after 1139 (probably 1140), Gratian compiled the Church laws (`canons') from all available sources and called the collection Concordia Discordantium Canonum (the harmonizing of discordant canons). The collection became known as the Decretum Gratiani. He died before 1179, some say as early as 1160. Although the Dectretum was not an official collection, it was, for a time and for all practical purposes, accepted as the fundamental text of Church law.