This German priest was recognized for his zealous reformist zeal within his order. He served as dean of the Faculty of Theology at the University of Cologne, where his lectures drew considerable interest. His name is associated with a controversial work on witchcraft, though modern scholars suggest this connection may have stemmed from his collaborator's desire to lend the book official authority. He also served as an inquisitor for several provinces, necessitating extensive travel.
A handbook for hunting and punishing witches to assist the Inquisition and Church in exterminating undesirables. Mostly a compilation of superstition and folklore, the book was taken very seriously at the time it was written in the 15th century and became a kind of spiritual law book used by judges to determine the guilt of the accused.