Imposing legal codices were mainly used for study and education, but the high quality of decoration of this book suggests this was an important and expensive commission. It was possibly ordered by a high-ranking cleric for personal use or it was made as a special gift. It was copied in the university milieu of Paris and then decorated by Maître Honoré who ran the most important Parisian workshop of the time.
The book opens with the Decretales promulgated by Pope Gregory IX in 1234. It was the first official compilation of canon law since the Decretum Gratiani (c. 1140) and consisted of five books. Next follow twelve more treatises; the most recent referring to 1281.
The marvelous miniatures show: f. 1r: Pope in the middle of his counsellors pointing at his book, and: Initial G: Scholar at lectern contemplating his work – f. 65r: Dominican monk and clerics discussing the case of a lady holding a sealed charter, and: Initial D: Scribe writing – f. 123r: Expulsion of a laic from the liturgical space during mass – f.178r: Marriage ceremony by joining right hands – f. 195r: Pope judging the case of an abbot – f. 272r: Initial S, Cardinal at lectern.
Such grand legal codices are exciting objects. Made for use, texts were supplemented, added to, cancelled and deleted. This book belonged to a certain Johannes de Castex (f. 12r) who likely was not the first owner. A canonist, he added a number of sophisticated glosses (comments) – among others those by Johannes Andreae, which date to the first quarter of the 14th century. Castex's name indicates that he came from the region of the Langue d’oc, but he remains as of yet unidentified. Possibly he was connected to the Papal Curia that resided in Avignon from 1309.