The Decretum Gratiani is a collection of Canon law compiled in the twelfth century by a jurist named Gratian.
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The Decretum of Burchard of Worms, a collection of Canon law compiled the early eleventh century.
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Decretum de Judaeis is the name given to the series of draft documents of the Second Vatican Council which led to ground-breaking progress in the Church's relations with Jews.
It consists of five manuscript folios, contains quotes from the Vulgate and Vetus Latina Bible; patristic commentary by Augustine, Jerome, Cyprian, Origen, Ambrosiaster and Gregory the Great; extracts from Canon law, ecclesiastical history and synodal decrees from Nicea and Arles in their original, uncontaminated forms, in addition to a decretum that enjoined on the Irish that, if all else failed, they should take their problems to Rome.
Less well-known was the commentary of Simon of Bisignano, which consisted of the Glosses on the Decretum and the Summa Simonis.
Johannes Teutonicus Zemeke (d. 1245) - glossator on the Decretum Gratiani, see Glossa Ordinaria