"There are plenty of eye-witness accounts. Just because you're so narrow-minded you need to have everything shoved under your nose before you–"
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Lady Carmilla Sanguina (1561-1757) was a vampire. She believed that blood would retain her health and beauty, so she bathed in the blood of her victims.
Behind the scenes
Lady Sanguina may have been been inspired by Erzsébet Báthory, a 16th-century Hungarian countess who was accused of killing young women, then bathing in their blood.
Carmilla is a Gothic 19th-century novel written by Sheridan Lefanu and starring a female vampire with that name. The story has been adapted to cinema and comic-books, with the character (or similar characters with the same name) appearing in other franchises.
The surname Sanguina is derived from the Latin sanguineus, which means "of blood," "bloody," or "bloodthirsty."