On Manicheism, videBeausobre’s Critical History of Manicheism, and Walch, Hist. Ketz. i. 770.  With its theory of two principles it spread widely over the empire in the 4th c., was vigorous in Armenia in the 9th, and is said to have appeared in France in the 12th.  (cf. Bayle, Dict. s.v.)  On the view taken of the heresy in Basil’s time cf. Gregory of Nyssa, Against Eunomius i. § 35.