Philip, the King of France, married Ingeborg of Denmark, and it would have been a really great political alliance, except that after the wedding night Philip wanted out.  So he asked the pope to annul the marriage, saying that it hadn't been consummated, on account of witchcraft, and he sent Ingeborg to a convent. But Ingeborg said the marriage HAD been consummated, and the pope wouldn't annul the marriage, so Philip had a genealogy made up showing that his marriage to Ingeborg violated canon law because they were too closely related, since Philip's first wife had been Ingeborg's first cousin once removed, but it was a fake genealogy, Philip's first wife being Ingeborg's fourth cousin once removed, and nobody believed it. They eventually got reconciled, after the wife that Philip had married bigamously in the interim died. So there's that. Michelle got so interested in the idea of using witchcraft to make husbands impotent  (in the middle ages of course, not now)  that she ordered a book on it, so we can look forward to that.