From the Council of Arles, A.D. 813

Canon XI. Concerning incestuous conjunctions, just as it was instituted by the most holy Fathers, we reserve absolutely nothing of pardon, unless they have healed the adultery by separation. But those incestuous persons, not to be reckoned by the name of any marriage, whom it is even deadly to designate, we judge to be these: if anyone has violated by carnal conjunction the widow of his brother, who almost before had existed as a sister; if any brother has accepted the full sister of his wife; if anyone has led his stepmother; if anyone associates himself to his female cousin; if anyone is mingled with the widow or daughter of his maternal uncle; or is polluted by concubitus with the daughter of his paternal uncle or with his own stepdaughter; or if there is anything of this sort which is both long to note here and plunges any negligent person into the abyss of destruction.

The canon of the Synod of Agde or of Epaon is again confirmed. Here it is read: "if anyone has accepted the full wife of his brother"; there: "if any brother [has accepted] the full sister of his wife," which reading is to be preferred. Likewise here it is read: "daughter of the father"; there: "daughter of the paternal uncle," which reading perhaps is to be retained also in this canon of Arles. The Fathers of Epaon added: "or if anyone has polluted by concubitus someone from his own consanguinity, or (her) whom a blood-relative had." That the Fathers of Arles, following the institutions of the Fathers, wished to confirm this again is indubitable from those words: "and if there is anything of this sort," etc.