of sin, but also the incarnate Deity, whom Satan lacked the ability to enslave. Irenaeus of Lyons described a prototypical form of the ransom theory, but Origen was the first to propose it in its fully developed form. The theory was later expanded by theologians such as Gregory of Nyssa and Rufinus of Aquileia. In the eleventh century, Anselm of Canterbury criticized the ransom theory, along with the associated Christus Victor theory, resulting in the theory's decline in western Europe. The theory has nonetheless retained some of its popularity in the Eastern Orthodox Church. Most early Christians firmly believed that Satan and his demons had the power to possess humans and exorcisms were widely practiced by Jews, Christians, and pagans alike. Belief in demonic possession continued through the Middle Ages into the early modern period. Exorcisms were seen as a display of God's power over Satan. The vast majority of people who thought they were possessed by the Devil did not suffer from hallucinations or other "spectacular symptoms", but "complained of anxiety, religious fears, and evil thoughts." Middle Ages Satan had minimal role in medieval Christian theology, but he frequently appeared as a recurring comedic stock character in late medieval mystery plays, in which he was portrayed as a comic relief figure who "frolicked, fell, and farted in the background". Jeffrey Burton Russell describes the medieval conception of Satan as "more pathetic and repulsive than terrifying" and he was seen as little more than a nuisance to God's overarching plan. The Golden Legend, a collection of saints' lives compiled in around 1260 by the Dominican Friar Jacobus de Voragine, contains numerous stories about encounters between saints and Satan, in which Satan is constantly duped by the saints' cleverness and by the power of God. Henry Ansgar Kelly remarks that Satan "comes across as the opposite of fearsome." The Golden Legend was the most popular book during the High and Late Middle Ages and more manuscripts of it have survived from the period than for any other book, including even the Bible itself. The Canon Episcopi, written in the eleventh century AD, condemns belief in witchcraft as heretical, but also documents that many people at the time apparently believed in it. Witches were believed to fly through the air on broomsticks, consort with demons, perform in "lurid sexual rituals" in the forests, murder human infants and eat them as part of