The Wild Hunt is a European folk myth involving a ghostly or supernatural group of huntsmen passing in wild pursuit. The hunters may be either elves or fairies or the dead, and the leader of the hunt is often a named figure associated with Woden (or other reflections of the same god, such as Alemannic Wuodan in Wuotis Heer ("Wuodan's Army") of Central Switzerland, Swabia etc.), but may variously be a historical or legendary figure like Theodoric the Great, the Danish king Valdemar Atterdag, the Welsh psychopomp Gwyn ap Nudd, biblical figures such as Herod, Cain, Gabriel or the Devil, or an unidentified lost soul or spirit either male or female. Seeing the Wild Hunt was thought to presage some catastrophe such as war or plague, or at best the death of the one who witnessed it. People encountering the Hunt might also be abducted to the underworld or the fairy kingdom. In some instances, it was also believed that people's spirits could be pulled away during their sleep to join the cavalcade. The concept was developed based on comparative mythology by Jacob Grimm in Deutsche Mythologie (1835) as a folkloristic survival of Germanic pagan tradition, but comparable folk myths are found throughout Northern, Western and Central Europe. Grimm popularised the term Wilde Jagd ("Wild Hunt") for the phenomenon.