Countess Elizabeth Báthory de Ecsed (1560-1614) was a countess from the renowned Báthory family. Although in modern times she has been labelled the most prolific female serial killer in history, evidence of her alleged crimes is scant and her guilt is debated. Nevertheless, she is remembered as the "Blood Countess." She and 4 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 they were convicted was 80. Elizabeth herself was neither tried nor convicted. In 1610, however, she was imprisoned in the Csejte Castle, where she remained bricked in a set of rooms until her death four years later. (Wikipedia)