The Malleus Maleficarum (Latin for “The Hammer of Witches”, or “Hexenhammer” in German) is one of the most famous medieval treatises on witches. It was written in 1486 by Heinrich Kramer and Jacob Sprenger, and was first published in Germany in 1487. Its main purpose was to challenge all arguments against the existence of witchcraft and to instruct magistrates on how to identify, interrogate and convict witches.
Some modern scholars believe that Jacob Sprenger contributed little if anything to the work besides his name, but the evidence to support this is weak. Both men were members of the Dominican Order and Inquisitors for the Catholic Church. They submitted the Malleus Maleficarum to the University of Cologne’s Faculty of Theology on May 9, 1487, seeking its endorsement.