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canon law , Latin jus canonicum. body of laws made within certain Christian churches ( Roman Catholic. Eastern Orthodox, independent churches of Eastern Christianity, and the Anglican Communion) by lawful ecclesiastical authority for the government of both the whole church and parts thereof and of the behaviour and actions of individuals. In a wider sense the term includes precepts of divine law, natural or positive, incorporated in the canonical collections and codes.

Although canon law is historically continuous from the early church to the present, it has, as a result of doctrinal and ecclesiastical schisms, developed differing, though often similar, patterns of codification and norms in the various churches that have incorporated it into their ecclesiastical frameworks. The canon law of the Eastern and Western churches was much the same in form until these two groups of churches separated in the Schism of 1054. In Eastern Christianity, however, because of doctrinal and nationalistic disputes during the 5th to 7th centuries, several church groups (especially non-Greek) separated themselves from the nominal head of Eastern Christianity, the patriarch of Constantinople, and developed their own bodies of canon law, often reflecting nationalistic concerns.

Canon law in the Western churches after 1054 developed without interruption until the Reformation of the 16th century. Though other churches of the Reformation rejected the canon law of the Roman Catholic church, the Church of England retained the concept of canon law and developed its own type, which has acceptance in the churches of the Anglican Communion .

Canon law has had a long history of development throughout the Christian era. Not a static body of laws, it reflects social, political, economic, cultural, and ecclesiastical changes that have taken place in the past two millennia. During periods of social and cultural upheaval the church has not remained unaffected by its environment. Thus, canon law may be expected to be involved in the far-reaching changes that have come to be anticipated in the modern world.

Nature and significance