Ivo of Chartres
Ivo of Chartres (c. 1040-1115) was bishop of Chartres and an expert in canon law. He is best-known for three canonical collections: the Decretum, Panormia, and Tripartita. The Decretum, written c. 1094, is a compilation of texts regarding canon law in 3,760 chapters. It circulated throughout western Europe and Scandinavia, but there are only a few surviving copies. The more popular compilation was the Panormia (c. 1095), another collection of texts regarding the canon law compiled in fewer chapters (about 1,200). There are more than 100 surviving manuscripts of this text. Finally, the Tripartita (c. 1093-1095) contains decretals from Clement I to Urban II, conciliar canons, and extracts from the Decretum. Ivo also wrote sermons, only 23 of which survive. The Fragmenta Manuscripta 005 contains part of Sermon IV, “De sacramentis dedicationis.” Ivo also wrote some 300 letters that reference issues regarding theology and canon law.
 Jean Gaudemet, “Ivo of Chartres,” in Encyclopedia of the Middle Ages, ed. by André Auchez (Cambridge: James Clarke & Co, 2000).