The
Decretum Gratiani, also known as the
Concordia discordantium canonum or
Concordantia discordantium canonum, is a collection of
Canon law compiled and written in the 12th century as a legal textbook by the
jurist known as
Gratian. It forms the first part of the collection of six legal texts, which together became known as the
Corpus Juris Canonici. It was used by
canonists of the
Roman Catholic Church until Pentecost (May 19) 1918, when a revised
Code of Canon Law (
Codex Iuris Canonici) promulgated by
Pope Benedict XV on 27 May 1917 obtained legal force.