This document summarizes the history and practice of exorcism. It discusses how exorcism originated in ancient times as a treatment for abnormal behavior believed to be caused by evil spirits or demons possessing a person. The document describes the types of spirits or demons that were believed to cause possession, including Lucifer, Mammon, and Beelzebub. It outlines the techniques traditionally used in exorcism, such as magic, prayer, incantations and noisemaking. Finally, it provides a six-step process for how exorcisms were performed, including identifying the demon, breaking its pretense of being the victim, the expulsion of the spirit through invoking the name of Jesus Christ.