 Instructions for their guidance were found in several writings of Augustine, especially in "De opere monachorum" (P.L., XL, 527), mentioned in the ancient "codices regularum" of the eighth or ninth century as the "Rule of St. Augustine".Epistola ccxi, otherwise cix (P.L., XXXIII, 958), contains the early "Augustinian Rule for Nuns"; Epistolae ccclv and ccclvi (P.L., mmmlxv, 3065) contains "De moribus clericorum".Between 430 and 570 this life-style was carried to Europe by monks and clergy fleeing the persecution of the Vandals.