In Swedish folklore, the Storsjöodjuret (, literally "The Great-Lake Monster") is a lake monster said to live in the lake Storsjön in Jämtland in the middle of Sweden. The lake monster is first attested in a 1635 manuscript, according to which the sea/lake serpent (sjöorm) was bound up magically in the lake's depths by Kettil Runske who carved his spell into the Frösö Runestone (Frösö being an island in this lake). Later folk legends circulating locally in Jämtland claimed the monster was a product of tinkering by two trolls, and that it was a cat-headed creature with a black serpentine body. There have been numerous eyewitness accounts since the 19th century, giving varying details, some claiming a dog-like head. Name The monster is popularly referred to as Storsjöodjuret (the noun Storsjöodjur was first used in 1899) where odjur is a Swedish word for ‘monster’ or ‘large vermin’, literally ‘unanimal’. While Storsjö is the name of a lake (or lakes), storsjö can also be a common noun meaning ‘great-lake’, being the compound of Swedish stor (‘big’ or ‘great’) and sjö (‘lake’) . Sometimes it is simply called Storsjödjuret (‘The great-lake animal’). In the English language Storsjöodjuret is sometimes called Storsie, similarly to Nessie, though the names Storsjö Monster, Storsjoe Monster or "the monster of Lake Storsjön", etc., and the literal translation The Great Lake Monster are used. Its Latin name is Hydogiganta Monstruidae Jemtlandicum. It has also been called Storsjöormen (‘The Great Lake Serpent’). Legends 17th century attestations The earliest description is of a sea/lake-serpent () inhabiting Storsjön, contained in a manuscript by Morten Pedersen Herdal dated to 1635. According to commentators this text ascribed to rune-master Kettil Runske the feat of binding this serpent to the bottom of the lake by carving a magic spell into the Frösö Runestone (erected on Frösö, an island in this lake). A version of the legend was also recorded in the group of writings associated with the (‘Researches into Antiquities’), specifically in a piece dated 1685 by Anders Plantin (Andreas Plantinus): "It is said that beneath this [rune]stone lies a dreadfully large head of a serpent and that the body stretches over Storsjön to village and Hille Sand where the tail is buried. The serpent was called a rå and therefore shall this stone be risen. Since no one peacefully could cross [Storsjön], the ferryman and his wife states, along with many others, that