From the Council of Nantes, A.D. 658

Although this council is referred by collectors of Councils to the tenth century, it was probably held, according to Sirmondus, in A.D. 658. For the following decree of the same is recited by Benedict the Levite in his collection of capitularies, L. III, n. 382, who wrote before the middle of the ninth century. Moreover, that in this year, 658, a Synod of Nantes was held, we are taught by Flodoard.

Canon XII. If any man's wife has perpetrated adultery, and this has been detected and published by the husband, let him dismiss the wife, if he wishes, because of fornication; but let her do public penance for seven years. But her husband, while she is living, shall by no means accept another. But if he wishes to reconcile the adulteress to himself, he has license, yet in such a way that he do penance together with her, and after the penance has been completed, after seven years, both shall approach communion. A similar form will also be observed in a woman, if her husband has committed adultery.

It seemed to these Fathers less honorable, and therefore to be expiated by penance, if the adulteress were retained. Cf. Canon LXX of Elvira. Meanwhile you discern the perfect indissolubility of marriage.