Lady Erzsébet Báthory was a Hungarian countess that was accused of torturing and killing hundreds of innocent girls and women between 1590 and 1610. While she didn't go to prison she was imprisoned in her own castle, Castle Čachtice. She was said to have bathed in the blood of her victims and is frequently fictionalized as a vampire and connected with Dracula who based on Vlad the Impaler, the Voivode of Wallachia. After her death it's said that it was forbidden to mention the her name.
In one account Dracula encountered Elizabeth Bathory the Blood Countess and sought to make her his vampiric servant. However, Bathory's practice of bathing in blood made her immune to him, and she porposed an alliance with him instead. Elizabeth then betrayed Dracula by placing garlic on his coffin. Dracula turned into mist to escape and in retaliation, he turned Bathory's journals to authorities. Bathory was arrested and was placed in confinement within her own castle. Dracula confronted her and drained her blood, aging her to death in seconds.
Big Dog Ink
Naomi meets Lady Bathory for the first time in hundreds of years.
Empire of Blood
An alternative history version of the British Empire is ruled over by "The Blood Queen". She is impervious to illness and injury, thanks to a serum called Aqua Vitae.
Night Phoenix Press
After being imprisoned in her castle Countess Elizabeth Báthory aka The Blood Countess, was visited by the Vampire Lord Count Dracula. The Count convinced her to join his coven of vampires, including him and "The Sisters" and they've traveled together every since.
Epitaph: Bread and Salt/ Victor Locke Demon Hunter/ VLDH: Demon Noir
Lady Bathory came to Chicago with Dracula to start a new Vampire Alliance after the death of the original team. This was seen in the original versions of various books, but it's canonized in Victor Locke Demon Noir as she worked with him to try to make contact with a demon that had just come to our world and two of the sisters are shown to be doing reconnaissance.