In folklore, a werewolf (Old English: werwulf, "man-wolf"), or occasionally lycanthrope /ˈlaɪkənˌθroʊp/ (Greek: λυκάνθρωπος lukánthrōpos, "wolf-human", Ukrainian: Вовкулака, Vovkulaka), is a human with the ability to shapeshift into a wolf (or, especially in modern film, a therianthropic hybrid wolf-like creature), either purposely or after being placed under a curse or affliction (often a bite or the occasional scratch from another werewolf) with the transformations occurring on the night of a full moon. Early sources for belief in this ability or affliction, called lycanthropy /laɪˈkænθrəpi/, are Petronius (27–66) and Gervase of Tilbury (1150–1228).
Like the witchcraft trials as a whole, the trial of supposed werewolves emerged in what is now Switzerland (especially the Valais and Vaud) in the early 15th century and spread throughout Europe in the 16th, peaking in the 17th and subsiding by the 18th century. The persecution of werewolves and the associated folklore is an integral part of the "witch-hunt" phenomenon, albeit a marginal one, accusations of lycanthropy being involved in only a small fraction of witchcraft trials.
Various methods for becoming a werewolf have been reported, one of the simplest being the removal of clothing and putting on a belt made of wolfskin, probably as a substitute for the assumption of an entire animal skin (which also is frequently described). In other cases, the body is rubbed with a magic salve. Drinking rainwater out of the footprint of the animal in question or from certain enchanted streams were also considered effectual modes of accomplishing metamorphosis. The 16th-century Swedish writer Olaus Magnus says that the Livonian werewolves were initiated by draining a cup of specially prepared beer and repeating a set formula. Ralston in his Songs of the Russian People gives the form of incantation still familiar in Russia. In Italy, France and Germany, it was said that a man or woman could turn into a werewolf if he or she, on a certain Wednesday or Friday, slept outside on a summer night with the full moon shining directly on his or her face.
In other cases, the transformation was supposedly accomplished by Satanic allegiance for the most loathsome ends, often for the sake of sating a craving for human flesh. "The werewolves", writes Richard Verstegan (Restitution of Decayed Intelligence, 1628), "are certayne sorcerers, who having annoynted their bodies with an ointment which they make by the instinct of the devil, and putting on a certayne inchaunted girdle, does not only unto the view of others seem as wolves, but to their own thinking have both the shape and nature of wolves, so long as they wear the said girdle. And they do dispose themselves as very wolves, in worrying and killing, and most of humane creatures."
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Text from Wikipedia