Decretales Gregoru Noni
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
The decretals of Gregory the Ninth. A collection of the laws of the church, published by order of Gregory IX. in 1227. It is composed of five books, subdivided into titles, and each title is divided into chapters. They are cited by using an X, (or extra;) thus "Cap. 8 X de Regulis Juris," etc.