Jacob Sprenger (Jacob Sprenger| 1436, Rheinfelden - December 6, 1495, Strasbourg) - professor of theology, inquisitor, famous demonologist, German Dominican, dean of the University of Cologne, is considered the co-author of the book "The Hammer of the Witches", written jointly with Prior Heinrich Institoris. However, Sprenger's work seems to have been limited to an introduction called "Apology".Heinrich Kramer (Heinrich Kramer, also known as Henricus Institor), 1430, Schlettstadt - 1505, Brno or Olomouc, Bohemia) is a German monk of the Dominican order, the author of The Hammer of the Witches. (The form of the name "Institoris" on the title page of the book is the Latin genitive - the genitive - and reads: "Hammer of the Witches" from Institor" | often this genitive is mistaken for the nominative form of the name. The Latin word "Institor" is an exact translation into the Latin language of the German word "Kramer" - small change dealer).Heinrich believed that he was sent by the Lord himself to cleanse this world of heresy. He conducted his first investigation, already in the capacity of an inquisitor, in the Italian town of Triente. Then it was about the murder of the two-year-old boy Simonio, presumably this was done by a group of Jews in the course of a ritual murder. During this investigation, Heinrich Kramer pronounced the death sentence on nine Jews from Trient, the murdered child was canonized. In 1484, the Pope signed a document drawn up for him by Heinrich Kramer: according to the Witches' Bull, the German authorities must do everything in their power to help the inquisitors in the fight against witches. Around 3,000 so-called "witches" perished in Kramer's time. The Hammer of the Witches or "Hexenhammer" is undoubtedly the main and darkest of all works on demonology. It was a binding code that united the ancient legends of black magic with the church dogma of heresy, opening the floodgates to the flow of inquisitorial hysteria as widely as a printed work could ever do.

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