Countess Elizabeth Báthory de Ecsed was a Hungarian noblewoman and alleged serial killer from the Báthory family, who owned land in the Kingdom of Hungary. Báthory and four of her servants were accused of torturing and killing hundreds of girls and women from 1590 to 1610. Her servants were put on trial and convicted whereas Báthory was imprisoned within the Castle of Csejte (Čachtice), where she died under mysterious circumstances.

A serial killer is a person who murders three or more people, with the killings taking place over a significant period of time between them. The serial killers' psychological gratification is the motivation for the killings, and many serial murders involve sexual contact with the victims at different points during the murder process. The Federal Bureau of Investigation (FBI) states that the motives of serial killers can include anger, thrill-seeking, financial gain, and attention seeking, and killings may be executed as such. The victims tend to have things in common such as, demographic profile, appearance, gender or race. The FBI will focus on particular patterns that the serial killers follow throughout their murders. They will then use on the patterns they find for key clues into finding the killer along with their motives. Although a serial killer is a distinct classification that differs from that of a mass murderer, spree killer, or contract killer, there are overlaps between them.