During April 1574, an aspiring London barrister named Robert Brigges was possessed by Satan. For three weeks, Brigges shouted, raged, and sobbed; suffered from sensory deprivations; and engaged in impassioned disputes with his invisible adversary. Although Brigges's case was considered significant in its time, it is virtually unknown today, with modern scholars rarely mentioning and never analyzing it. The case, however, is very unusual--perhaps unique among English cases--in its first-person, spontaneous, highly detailed documentation of the afflicted person's experience and in its...

In October of 1563, 18-year old Anne Mylner was herding cows near her home when she was suddenly enveloped by a white cloud that precipitated a months-long illness characterized by sleeplessness, loss of appetite, convulsions, and bodily swelling. Mylner's was the first of several cases during the reign of Elizabeth I of England that were interpreted as demon possession, a highly emotional experience in which an afflicted person displays behavior indicating a state of religious distress. To most Elizabethans, belief in Satan was as natural as belief in God, and Satan's affliction of...