Huh. I think I thought of the actual last book I read. It was Courtesan by Diane Haegar. I believe that's how her last name is spelled...
If you like historical nonfiction (though I think a few parts were probably fictionalized a WEE bit, haha) it's a really, really entertaining read. It takes place during the reigns of two different kings of France, Francois I and Henri II. During Francois I's reign, a woman who was cast out of court named Diane de Poitiers was invited to return. And she ends up falling for/becoming the mistress of his son, Henri, who eventually married Catherine de Medici...anyway, the factual stuff is fascinating, and the fact that the end is true amazes me and breaks my heart. Basically, Henri II suffered one of the most tragically horrible deaths I've ever heard of in my life.
And it seriously HAPPENED. Oh emm gee.
I recommend it. It's a very good love story, if you like that sort of thing, and I couldn't stop reading it. After I finished it, I did a bit of research into the reigns of Francois I and Henri II. Interesting stuff, and the book gets most of it right.