This canon is found in the Corpus Juris Canonici, Gratian’s Decretum, Pars I., Distinc. xxx., c. xii. (Isidore’s version), and again Dist. xxxi., c. viii. (Dionysius’s version). Gratian, however, supposes that the canon is directed against the Manichæans and refers to the marriage of priests, but in both matters he is mistaken, as the Roman Correctors and Van Espen point out.