Grattan’s de-cree, or decretum. A collection of eccleslas-tical law in three books or parts, made in the year 1151, by Gratian, a Benedictine monk of Bologna, being tiie oldest as well as tbe first in order of the collections which to-gether form the body of the Roman canon law. 1 Bl. Comm. 82; 1 Reeve, Eng. Law, 67