Heinrich Kramer (c. 1430 – 1505, aged 74-75), 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. Source: Wikipedia (en)