St. Theodore of Canterbury ca. 602-690
Of Marriages: that nothing be allowed but lawful wedlock; that none commit incest; no man quit his true wife, unless, as the Gospel teaches, on account of fornication. And if any man shall put away his own wife, lawfully joined to him in matrimony, that he take no other, if he wishes to be a good Christian, but continue as he is, or else be reconciled to his own wife. (Synod of Hertford ca. 673, Canon 10. St. Bede’s Ecclesiastical History of the English Nation Bk. 4.5)
