“You who are already, by the will of God and the commands of your father, lawfully married to noble wives of your own nation, whom you are bound to cherish. And certainly it is not lawful for you to put away the wives you have and marry others, or ally yourselves in marriage with a foreign people, a thing never done by any of your ancestors.... It is wicked of you even to entertain the thought of marrying again when you are already married. You ought not to act thus, who profess to follow the law of God, and punish others to prevent men acting in this unlawful manner. Such things do the heathen. But they ought not to be done by you who are Christians, a holy people and a kingly priesthood.”  Pope Stephen III (IV), writing to both Charlemagne and Carloman  (Mann, Horace K., The Lives of the Popes in the Early Middle Ages, Vol. I: The Popes Under the Lombard Rule, Part 2, 657-795 (1903), pg. 380)