Canon Law and the Decretum Gratiani 1140
Gratian (c.1110–c. 1158)
Most people associate canon law with the Catholic Church because of its religious origins and nature. While canon law is primarily concerned with worship, clergy, and the Church, it also has secular legal implications. Legal historians have praised it as an important aspect of the Western legal system.
Much of Europe operated under two legal systems beginning in the late eleventh and early twelve centuries: Roman law and canon law. The two systems competed but also complimented one other, and the former affected the latter. Canon law has its beginnings in ecclesiastical ideas and Church teachings, but it has now expanded to embrace secular matters.