Countess Elizabeth Báthory (August 7, 1560 – August 21, 1614) was a countess from the renowned Báthory family. She is possibly the most prolific female serial killer in history and is remembered as the “Blood Countess” and as the “Bloody Lady of Čachtice”, after the castle near Trencsén (today Trenčín) in the Kingdom of Hungary, (today’s Slovakia), where she spent most of her adult life.
After her husband’s death, she and four collaborators were accused of torturing and killing hundreds of girls and young women, with one witness attributing to them over 600 victims, though the number for which she was convicted was 80. In 1610, she was imprisoned in the Csejte Castle, where she remained bricked in a set of rooms until her death four years later.