In 1414, Philip IV of France had three adult sons, all married.  There should have been no problem with the royal lineage.  Too bad that Philip's three daughters-in-law all got into trouble, because two of them were having affairs with a couple of Norman brothers who were knights of the household.  Too bad, indeed. Torture, executions, dungeon incarcerations, and the dying off of the Capetian line would follow.  Oh, and Isabella the She Wolf was involved.  (Bonus!  Michelle explains the Three Rules of Regifting, none of which the princesses paid any attention to.  Big mistake.)