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Heinrich Kramer (c. 1430 – 1505), also known under the Latinized name Henricus Institor, was a German churchman and inquisitor. With his widely distributed book Malleus Maleficarum (1487), which describes witchcraft and endorses detailed processes for the extermination of witches, he was instrumental in establishing the period of witch trials in the early modern period.
At some date before 1474 he was appointed Inquisitor for the Tyrol, Salzburg, Bohemia and Moravia. His eloquence in the pulpit and tireless activity received recognition at Rome and he was the right-hand man of the Archbishop of Salzburg.
The papal bull Summis desiderantes which Pope Innocent VIII published in 1484 acknowledges the existence of witches and explicitly empowers the inquisition to prosecute witches and sorcerers. This bull was incorporated in Kramer's book Malleus Maleficarum (literally "The Hammer of Witches") which was first published in 1487 and became very influential in endorsing the fight against witches.
Kramer failed in his attempt to obtain endorsement for this work from the top theologians of the Inquisition at the Faculty of Cologne, and they condemned the book as recommending unethical and illegal procedures, as well as being inconsistent with Catholic doctrines of demonology.
- Malleus Maleficarum
- Several Discourses and Various Sermons upon the Most Holy Sacrament of the Eucharist, Nuremberg, 1496
- A Tract Confuting the Errors of Master Antonio degli Roselli, Venice, 1499
- The Shield of Defence of the Holy Roman Church Against the Picards and Waldenses, c. 1500
- "Institoris" is the Latin genitive case of "Institor" ("retailer"). It was a common practice in those times to take the genitive of the father's name for latinization, but this genitive was used as nominative in Latin texts ("Venerabilis & religiosus frater Henricus institoris"). In German texts this name was abridged to "Institor," according to the custom of omitting Latin endings in translations (cf. "Iuvenalis" – "Juvenal").
- Paul Hinschius. Das Kirchenrecht der Katholiken und Protestanten in Deutschland. Band VI. 1897. Reprint Guttentag, 1959.
- Rothman, David J., Marcus, Steven and Kiceluk, Stephanie A., Medicine and Western Civilization, Rutgers University Press, 1995 ISBN 9780813521909
- Jolly, Raudvere, & Peters(eds.), "Witchcraft and magic in Europe: the Middle Ages", page 241 (2002)
- Reinhard Tenberg (1990). "Institoris, Heinrich". In Bautz, Friedrich Wilhelm. Biographisch-Bibliographisches Kirchenlexikon (BBKL) (in German). 2. Hamm: Bautz. cols. 1307–1310. ISBN 3-88309-032-8.