Ulrich Molitor (15th century) was a Professor of Law at the University of Constance, Germany.
He wrote one of the first books on witchcraft, De Lamiis et Pythonicis Mulieribus (The Witches and Diviner Women), published in 1489.
Although Molitor supported the death sentence for heretics and practitioners of witchcraft, from a moderate point of view for his time he considered that the Sabbaths were an illusion caused by the Devil and not a reality.
