These first three would fall into the Mistresses & Courtesans section and all of these were very good and as far as I could ascertain, very historically accurate as well.

Sex With Kings - Eleanor Herman
This one covers approximately 400-500 years of European history and includes many of the more notorious mistresses of European monarchs, what it took to become a maitresse-en-titre, the power they wielded, the wealth they accumulated, public opinion, their luckless husbands, etc.

Nell Gwyn - Derek Parker
This is pretty much your straight forward biography - Nell Gwyn (for those not familiar with her) was an actress who became one of Charles II of England's long-standing mistresses. She was a remarkable woman with a wicked sense of humor.

Athenais: The Real Queen of France - Lisa Hilton
This is a biography on the Marquise de Montespan, one of the mistresses of Louis XIV and the one who can really lay claim to being at least partially responsible for the glorious and glittering image of the Sun King's court during its height. While Eleanor Herman's book listed above tends to show the scheming side of Athenais, this bio is a little more well-rounded and gives a glimpse into the woman herself.

The Medieval Underworld - Andrew McCall
I have to admit that this is probably one of the very few books I've read where the footnotes are as interesting as the main text of the book. LOL Andrew McCall gives a well-rounded look into the criminal element of the medieval age and covers topic ranging from crime and punishment to heretics (and quite a bit inbetween)

These next two I think should fall under the Unjustly Accused section, tho some would probably argue that point with me. LOL The first, Dracula Was a Woman authored by Raymond T. McNally was a complete and utter disappointment so I'd warn off this one. I had heard rave reviews about it from those that read it, but I found it to be nothing but a perpetuation of the Elizabeth Bathory legend and not giving much to real historical research into not only her, but the age that created her. I'd also say that a good 3/4 of the book is nothing but digressions into lycanthropy, vampirism and other nonsense that has no relation to the historical Countess Bathory. On the flip side, I would very highly recommend Tony Thorpe's Countess Dracula: The Life & Times of Elisabeth Bathory, the Blood Countess. This is what a biography is supposed to be like - Thorpe provides excellent information on Bathory's personal history, the political climate, the way of life, etc. and something in particular I liked was that he started by giving the facts, then he leaned towards testimony that pointed towards her innocence, then flipped back to evidence that could be construed to show her guilt. He really lets the reader make up their own mind on whether or not the infamous Blood Countess was a raving psychopath that craved blood, or if she was an intelligent and powerful Hungarian noblewoman that thru an expedient need to remove her, has gone down in history with one of the worst reputations imaginable. (guess you can figure out my viewpoint on the subject...LOL)