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Tammas flees the nuckelavee
The nuckelavee chasing an islander

The nuckelavee, or nuckalavee, is a horse-like demon from Orcadian mythology that combines equine and human elements. Originating in Norse mythology and the most horrible of all the demons of the Scottish islands, its name may be a progenitor of that by which the Devil is sometimes known, Old Nick. The nuckelavee's breath can wilt crops and sicken livestock, and the creature was held responsible for droughts and epidemics on land despite its being predominantly a sea-dweller.

A graphic first-hand description of the nuckelavee as it appears on land was given by an islander who claimed to have had a confrontation with it, but accounts describing the details of the creature's appearance are inconsistent. In common with many other sea monsters it is unable to tolerate fresh water, therefore those it is pursuing have only to cross a river or stream to be rid of it. The nuckelavee is kept in confinement during the summer months by the Mither o' the Sea, an ancient Orcadian divine and the only one able to control it.

Orcadian folklore had a strong Scandinavian influence, and it may be that the nuckelavee is a composite of a water horse from Celtic mythology and a creature imported by the Norsemen. As with similar malevolent entities such as the kelpie, it offered an explanation for incidents that simple islanders could not otherwise understand.


The late 19th century saw an upsurge of interest in transcribing folklore, but the recorders used inconsistent spelling and frequently anglicised words, thus the same entity could be given different names.[1] The term nuckelavee is a corruption of the Orcadian knoggelvi,[2] but the same demon is called a mukkelevi in Shetland, where it was considered a nasty sea trow or sea devil.[3] Derivatives may have been the progenitors of the name Old Nick given to the Devil.[4] According to Walter Traill Dennison, an Orcadian resident and folklorist, nuckelavee means "Devil of the Sea".[5]

Folk beliefs[edit]

Rough seas
The tempestuous seas of Orkney are home to the nuckelavee.

Description and common attributes[edit]

Stories of mythical Orcadian demons are recorded in the 16th-century Latin manuscripts of Jo Ben,[a] who may have been referring to the nuckelavee in his description of the Orkney island of Stronsay.[9] Dennison transcribed much of the information available about traditional tales told on Orkney, but to an extent romanticised and systematically altered certain elements of the stories in the process of transforming them into prose.[10][b]

The nuckelavee is a mythical sea creature that appears as a horse-like demon when it ventures onto land.[12] Writer and folklorist Ernest Marwick considered it very similar to the Norwegian nøkk, the nuggle of the Shetlands and the kelpie. A unique and solitary creature possessing extensive evil powers, its malevolent behaviour can influence events throughout the islands.[3] Islanders were terrified of the creature and would not speak its name without immediately saying a prayer.[13] It was often found in the vicinity of a beach, but would never come ashore if it was raining.[14]

No tales describe what form the nuckelavee takes when in the sea,[5] but its appearance on land has been recounted in graphic detail.[15] An islander, Tammas, survived a confrontation with the beast and, after much cajoling from Dennison, reluctantly gave his description of the monster, the only known first-hand account.[c] According to Tammas, the nuckelavee has a man's torso attached to a horse's back as if it were a rider.[5] The male torso has no legs, but its arms can reach the ground from its position on top of the equine body, the legs of which have fin like appendages.[13] The torso has a large head – possibly as much as 3 feet (0.91 m) in diameter – that rolls back and forth.[14] The monster described by Tammas has two heads;[17] the equine head has an enormous gaping mouth that exudes a smelly toxic vapour, and a single giant eye like a burning red flame. A particularly gruesome detail is that the nuckelavee has no skin;[18] black blood courses through yellow veins, and the pale sinews and powerful muscles are visible as a pulsating mass.[13] Other reports state that the creature resembles a centaur;[19] narratives are inconsistent in the finer details of the demon's description however.[2] Traill Dennison only describes a man's head with a "mouth projected like that of a pig".[13] Marwick also only mentions one head with a single red eye, and he borrows some of Tammas's characterisation by recording the creature's mouth as "like a whale's".[14]

The nuckelavee's breath can wilt crops and sicken livestock, and it was considered responsible for epidemics and drought.[13] Seaweed burning to create what was known at the time as kelp began on Stronsay in 1722. The product – soda ash – was an alkali mainly used to treat acidic soil,[3][13] although as time went on its commercial importance in soap and glass manufacture increased. The pungent smoke emitted during the process can enrage the nuckelavee,[3] resulting in a wild rampage of plague, the deaths of cattle and the destruction of crops.[20][21] The nuckelavee infected horses on Stronsay with the deadly disease known as mortasheen,[d] to demonstrate its fury and exact its revenge against the islanders for burning seaweed; the infection subsequently spread to all the other islands involved in the industry.[3][23] The creature can impose prolonged periods of abnormally low rainfall, leading to water shortages and poor harvests.[3]


The nuckelavee is the most malevolent of the demons in and around the Scottish islands, without any redeeming characteristics.[24] The only entity able to control it is the Mither o' the Sea, an ancient divine in Orcadian mythology who keeps the nuckelavee confined during the summer months.[25] In common with other mythical sea monsters, with the possible exception of kelpies and the nuggle of Shetland, it is unable to wade through fresh flowing water,[18] therefore those it is chasing have only to cross a stream to be rid of it.[26] Tammas managed to escape from the nuckelavee after he inadvertently splashed it with water from the loch he was alongside; this briefly distracted the monster, allowing Tammas to run over to a nearby channel of fresh water and jump to safety on the opposite bank.[17]


Malevolent creatures served to provide explanations for incidents that simple islanders were otherwise unable to account for; many ancient myths were based upon the natural elements of the turbulent and ever changing sea around Orkney.[27] Established Orcadian tales were strongly influenced by Scandinavian mythology with a blending of traditional Celtic stories,[28] so the nuckelavee may have its roots in a mythical creature imported by the Norsemen fused with a traditional Celtic water horse.[2]



  1. ^ It is uncertain why Jo Ben compiled the manuscript Descriptions of Orkney, which provides a sequential account of the Orkney Islands recording details of traditions and development. Various suggestions have been made as to his identity: Scran states he was John Ballender and had been sent to carry out a survey of the islands;[6] historical geographer Charles W. J. Withers suggests he was John Benston or Beinston, an Orkney bishop's clerk;[7] and local historian Sigurd Towrie indicates he may have been John Bellenden or Ballendon, attributing the manuscript to be "the oldest surviving account of the Orkney Islands, after they transferred to Scotland in 1468".[8]
  2. ^ Specific dates are not given for exactly when Traill Dennison gathered the tales but his various transcripts were published between 1880 and 1894.[11]
  3. ^ As alluded to by Walter Traill Dennison, to whom the story was told, Tammas's account bears a certain resemblance to the events in Robert Burns's poem Tam o' Shanter (1790).[16]
  4. ^ This is now commonly known as glanders.[22]


  1. ^ Monaghan (2009), pp. ix, xi, xv
  2. ^ a b c "The Nuckelavee – Devil o' the Sea",, archived from the original on 27 June 2014, retrieved 14 June 2014 
  3. ^ a b c d e f Marwick (2000), p. 23
  4. ^ Hibbert (1891), p. 233
  5. ^ a b c Traill Dennison (1891), p. 131
  6. ^ "Jo Benn's 1529 Description of North Ronaldsay", Scran, archived from the original on 2 June 2015, retrieved 2 June 2015 
  7. ^ Withers (2001), p. 48
  8. ^ "Jo Ben's "Descriptions of Orkney"",, archived from the original on 2 June 2015, retrieved 2 June 2015 
  9. ^ "Jo Ben's 1529 "Descriptions of Orkney"",, archived from the original on 22 June 2014, retrieved 22 June 2014 
  10. ^ Jennings, Andrew, "The Finnfolk", University of the Highlands and Islands, archived from the original on 21 June 2014, retrieved 21 June 2014 
  11. ^ Marwick (2000), p. 205
  12. ^ Westwood & Kingshill (2012), p. 387
  13. ^ a b c d e f Traill Dennison (1891), p. 132
  14. ^ a b c Marwick (2000), p. 22
  15. ^ Briggs (2002), p. 67
  16. ^ Douglas (2010), p. 125
  17. ^ a b Traill Dennison (1891), p. 133
  18. ^ a b Westwood & Kingshill (2012), p. 388
  19. ^ Mack & Mack (2010), p. 57
  20. ^ "The kelp industry", Scapa Flow Landscape Partnership Scheme, archived from the original on 24 June 2014, retrieved 24 June 2014 
  21. ^ "Whale oil uses", Scran, archived from the original on 24 June 2014, retrieved 24 June 2014 
  22. ^ "mortercheyn", Dictionary of the Scots Language (Scottish Language Dictionaries), 2004, retrieved 24 June 2014 
  23. ^ Fenton (1997), p. 61
  24. ^ Briggs (2002), p. 68
  25. ^ Bane (2013), p. 252
  26. ^ Briggs (2002), p. 53
  27. ^ "The Sea in Orkney Folklore",, archived from the original on 26 June 2014, retrieved 26 June 2014 
  28. ^ Muir (2014), p. 10