Collectio canonum quadripartita
The Collectio canonum quadripartita (also known as the Collectio Vaticana or, more commonly, the Quadripartita) is an early medieval canon law collection, written around the year 850 in the ecclesiastical province of Reims. It consists of four books (hence its modern name 'quadripartita', or 'four-parted').
Source: Wikipedia — Collectio canonum quadripartita (CC BY-SA 4.0)