From the Council of Reims, about A.D. 625

Canon VIII. Concerning incestuous unions: if anyone within the degree prescribed by the canons, in incestuous order, has joined himself with those persons with whom he is prohibited by the divine rules, unless they testify to penance by separation, let them be deprived of communion.

Appeal is made to the canons already in force. Namely, those published in the preceding synods of the Gauls were held as the common law of the Church in the Gauls. There is no mention of laws proceeding from civil authority. Rather, the civil law followed the decree of the bishops. For in the Capitular of King Dagobert, who in the year 729 (according to Petavius) began his reign, both in the second for the Alamanni, n. 39, and in the third for the Bavarians, Tit. 6, n. 1, it is decreed: We prohibit incestuous nuptials. And so it is not lawful to have as wife a mother-in-law, daughter-in-law, stepdaughter, stepmother, daughter of a brother, daughter of a sister, brother's wife, wife's sister. Sons of brothers and sons of sisters shall by no presumption be joined among themselves. If anyone has done contrary to these things, let him be separated by the judges of the place and lose all his goods, which the fisc shall acquire.

Canon XXIII. Widows who have sought to be consecrated to the Lord, or girls consecrated to the Lord, let no one, sustained either by royal authority or by power of whatever kind, or by his own rashness, dare to abduct or drag away. But if both have consented, let them be deprived of communion.