Blanche of Castile served as regent of France on two occasions and held great power in the country even when she wasn’t ruling.
Catherine Gonsalvus was married off to a "freak" as a joke, but probably had a happy marriage, despite European royalty treating her family like animals.
Marie Antoinette of Austria was the Queen of France who had the bad luck of being consort during the French Revolution. Here is her last letter.
Guess who stole a diamond necklace and helped start the French Revolution? Jeanne de Valois-Saint-Rémy, Comtesse de la Motte.