A collection of imperial Roman constitutions or enactments made by one Gregorianus, of whom
nothing else is known; its date is not earlier than A.D. 295, as it contained an
exemplum edicti Diocletiani et Maximiani
of that year (Coll. Leg. Mos.
vi. 4). It comprised enactments of the emperors between Septimius Severus
(A.D. 195-211) and Diocletian and Maximian (A.D. 285-305), and possibly even some as far back
as Hadrian (A.D. 117-138). It was divided into at least thirty books—the books being
subdivided into “titles” and “rubrics,” the topics
being arranged after the order of the Perpetual Edict of Salvius Iulianus.