“The Hammer of Witches” (“Malleus Maleficarum”) is the best-known treatise on demonology, written by two German monks, Dominican inquisitors Heinrich Kramer and Jacob Sprenger, and published in the city of Speyer in 1487. The first part discusses the necessity for officials to fully understand the wickedness of witchcraft, which includes renouncing the Catholic faith, devotion and worship of the devil, offering him unbaptized children, and carnal relations with an incubus or succubus. The second part establishes three types of crimes committed by witches and the countermeasures against each of them. The third part contained formal rules for bringing a legal action against a witch, ensuring her conviction, and delivering a sentence.