Countess Erzsébet Báthory (Báthory Erzsébet in Hungarian, Alžbeta Bátoriová(-Nádasdy) in Slovak, Elżbieta Batory in Polish, August 7(?), 1560 – August 21, 1614), was a Hungarian countess from the renowned Báthory family.
She is considered the most infamous serial killer in Hungarian and Slovak history and is remembered as the Bloody Lady of Čachtice, after the castle near Trenčín, in Royal Hungary, in present-day Slovakia, where she spent most of her life.
After her husband's death, she and four alleged collaborators were accused of torturing and killing dozens of girls and young women, with some estimates as high as 600. In 1610, she was imprisoned in Čachtice Castle, where she remained in her room bricked in until her death four years later. Her nobility allowed her to avoid trial and execution. The Báthory case has inspired many stories featuring the countess bathing in the blood of her victims in order to retain her youth, which has led to the modern nicknames of the Blood Countess and Countess Dracula.