Canon law is a set of ordinances and regulations made by ecclesiastical authority for the government of a Christian organization or church and its members. It is the internal ecclesiastical law, or operational policy, governing the Catholic Church, the Eastern Orthodox and Oriental Orthodox churches, and the individual national churches within the Anglican Communion. The way that such church law is legislated, interpreted and at times adjudicated varies widely among these four bodies of churches. In all three traditions, a canon was originally a rule adopted by a church council; these canons formed the foundation of canon law.
The Decretum Gratiani, also known as the Concordia discordantium canonum or Concordantia discordantium canonum or simply as the Decretum, 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 as the main source of law by canonists of the Roman Catholic Church until the Decretals, promulgated by Pope Gregory IX in 1234, obtained legal force, after which it was the cornerstone of the Corpus Juris Canonici, in force until 1917.
The Code of Canons of the Eastern Churches is the title of the 1990 work which is a codification of the common portions of the canon law for the 23 Eastern Catholic Churches in the Catholic Church. It is divided into 30 titles and has a total of 1546 canons. The code entered into force in 1991.
The canon law of the Catholic Church is "how the Church organizes and governs herself". It is the system of laws and ecclesiastical legal principles made and enforced by the hierarchical authorities of the Catholic Church to regulate its external organization and government and to order and direct the activities of Catholics toward the mission of the Church. It was the first modern Western legal system and is the oldest continuously functioning system of law in the West, while the unique traditions of Eastern Catholic canon law govern the 23 Eastern Catholic particular churches sui iuris.
In the canon law of the Catholic Church, an impediment is a legal obstacle that prevents a sacrament from being performed either validly or licitly or both. The term is used most frequently in relationship to the sacraments of Marriage and Holy Orders. Some canonical impediments can be dispensed by the competent authority as defined in Catholic canon law.
Regulæ Juris, also spelled Regulae iuris, were legal maxims which served as jurisprudence in Roman law.
The Corpus Juris Canonici is a collection of significant sources of the Canon law of the Catholic Church that was applicable to the Latin Church. It was replaced by the 1917 Code of Canon Law which went into effect in 1918. The 1917 Code was later replaced by the 1983 Code of Canon Law, the codification of canon law currently in effect for the Latin Church.
The Acts of Roman Congregations is a term of the canon law of the Catholic Church, used to designate the documents issued by the Roman Congregations, in virtue of powers conferred on them by the Roman Pontiff.
Regarding the canon law of the Catholic Church, canonists provide and obey rules for the interpretation and acceptation of words, in order that legislation is correctly understood and the extent of its obligation is determined.
The 1917 Code of Canon Law, also referred to as the Pio-Benedictine Code, is the first official comprehensive codification of Latin canon law.
The 1983 Code of Canon Law, also called the Johanno-Pauline Code, is the "fundamental body of ecclesiastical laws for the Latin Church". It is the second and current comprehensive codification of canonical legislation for the Latin Church of the Catholic Church. The 1983 Code of Canon Law was promulgated on 25 January 1983 by John Paul II and took legal effect on the First Sunday of Advent 1983. It replaced the 1917 Code of Canon Law which had been promulgated by Benedict XV on 27 May 1917.
Edward Neal Peters is an American Roman Catholic canonist and serves as a referendary of the Apostolic Signatura. In 2023, he is professor of canon law at the Sacred Heart Major Seminary of the Archdiocese of Detroit.
The Catholic Church utilizes the oldest continuously functioning legal system in the West, much later than Roman law but predating the evolution of modern European civil law traditions. The history of Latin canon law can be divided into four periods: the jus antiquum, the jus novum, the jus novissimum and the Code of Canon Law. In relation to the Code, history can be divided into the jus vetus and the jus novum. Eastern canon law developed separately.
Promulgation in the Catholic canon law is the publication of a law by which it is made known publicly, and is required by canon law for the law to obtain legal effect. Universal laws are promulgated when they are published in Acta Apostolicae Sedis, and unless specified to the contrary, obtain legal force three months after promulgation. Particular laws are promulgated in various ways but by default take effect one month after promulgation.
In the canon law of the Catholic Church, the computation of time, also translated as the reckoning of time, is the manner by which legally-specified periods of time are calculated according to the norm of the canons on the computation of time. The application of laws frequently involves a question of time: generally three months must elapse after their promulgation before they go into effect; some obligations have to be fulfilled within a certain number of days, or weeks, or months. Hence the need of the rules for the computation of time.
A decree is, in a general sense, an order or law made by a superior authority for the direction of others. In the usage of the canon law of the Catholic Church, it has various meanings. Any papal bull, brief, or motu proprio is a decree inasmuch as these documents are legislative acts of the pope. In this sense the term is quite ancient. The Roman congregations were formerly empowered to issue decrees in matters which come under their particular jurisdiction, but were forbidden from continuing to do so under Pope Benedict XV in 1917. Each ecclesiastical province, and also each diocese may issue decrees in their periodical synods within their sphere of authority.
The Eastern Catholic canon law is the law of the 23 Catholic sui juris (autonomous) particular churches of the Eastern Catholic tradition. Eastern Catholic canon law includes both the common tradition among all Eastern Catholic Churches, now chiefly contained in the Code of Canons of the Eastern Churches, as well as the particular law proper to each individual sui juris particular Eastern Catholic Church. Oriental canon law is distinguished from Latin canon law, which developed along a separate line in the remnants of the Western Roman Empire, and is now chiefly codified in the 1983 Code of Canon Law.
The jurisprudence of Catholic canon law is the complex of legal theory, traditions, and interpretative principles of Catholic canon law. In the Latin Church, the jurisprudence of canon law was founded by Gratian in the 1140s with his Decretum. In the Eastern Catholic canon law of the Eastern Catholic Churches, Photios holds a place similar to that of Gratian for the West.
The following outline is provided as an overview of and topical guide to the canon law of the Catholic Church:
