The Decretum Gratiani, also known as the Concordia discordantium canonum or Concordantia discordantium canonum or simply as the Decretum, is a collection of Catholic 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 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.
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👉 Gratian (jurist) in the context of Photios I of Constantinople
Photios I of Constantinople (Greek: Φώτιος, Phōtios; c. 815—6 February 893), also spelled Photius (/ˈfoʊʃəs/), was the Ecumenical Patriarch of Constantinople from 858 to 867 and from 877 to 886. He is recognized in the Eastern Orthodox Church as 'Saint Photius the Great'.
Photios I is widely regarded as the most powerful and influential church leader of Constantinople subsequent to John Chrysostom's archbishopric around the turn of the fifth century. He is also viewed as the most important intellectual of his time—"the leading light of the ninth-century renaissance". He was a central figure in both the conversion of the Slavs to Christianity and the Photian schism, and is considered "[t]he great systematic compiler of the Eastern Church, who occupies a similar position to that of Gratian in the West," and whose "collection in two parts... formed and still forms the classic source of ancient Church Law for the Greek Church".
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Gratian (jurist) in the context of Ius (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.
Much of the legislative style was adapted from that of Roman law, especially the Justinianic Corpus Juris Civilis. As a result, Roman ecclesiastical courts tend to follow the Roman law style of continental Europe with some variation. After the fall of the Roman Empire and up until the revival of Roman law in the 11th century, canon law served as the most important unifying force among the local systems in the civil law tradition. The canonists introduced into post-Roman Europe the concept of a higher law of ultimate justice, over and above the momentary law of the state.