Corpus Juris Canonici in the context of "Eutychius of Constantinople"

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.

The Apostolic Canons, also called Apostolic canons (Latin: Canones apostolorum, "Canons of the Apostles"), Ecclesiastical Canons of the Same Holy Apostles, or Canons of the Holy Apostles, is a 4th-century Syrian Christian text. It is an Ancient Church Order, a collection of ancient ecclesiastical canons concerning the government and discipline of the Early Christian Church, allegedly written by the Apostles. This text is an appendix to the eighth book of the Apostolic Constitutions. Like the other Ancient Church Orders, the Apostolic Canons uses a pseudepigraphic form.

These eighty-five canons were approved by the Council in Trullo in 692 but were rejected by Pope Sergius I. In the Western Church only fifty of these canons circulated, translated in Latin by Dionysius Exiguus in about 500 AD, and included in the Western collections and afterwards in the Corpus Juris Canonici.