Fenrir the wolf.

In Norse mythology, Fenrir (Old Norse "fen-dweller"), Fenrisúlfr (Old Norse "Fenris wolf"), or Hróðvitnir (Old Norse "fame-wolf") is a monstrous wolf. Fenrir is attested in the Poetic Edda, compiled in the 13th century from earlier traditional sources, and the Prose Edda and Heimskringla, written in the 13th century by Snorri Sturluson. In both the Poetic Edda and Prose Edda, Fenrir is the father of the wolves Sköll and Hati Hróðvitnisson, and is foretold to kill the god Odin during the events of Ragnarök, but will in turn be killed by Odin's son Víðarr.

Fenrir is mentioned in three stanzas of the poem Völuspá, and in two stanzas of the poem Vafþrúðnismál. In stanza 40 of the poem Völuspá, a völva divulges to Odin that, in the east, an old woman sat in the forest Járnviðr, "and bred there the broods of Fenrir. There will come from them all one of that number to be a moon-snatcher in troll's skin". Further into the poem, the völva foretells that Odin will be consumed by Fenrir at Ragnarök.

In the stanza that follows, the völva describes that Odin's "tall child of Triumph's Sire" (Odin's son Víðarr) will then come to "strike at the beast of slaughter", and with his hands, he will drive a sword into the heart of "Hveðrungr's son", avenging the death of his father.

In the first of two stanzas mentioning Fenrir in Vafþrúðnismál, Odin poses a question to the wise jötunn Vafþrúðnir:

In chapter 13 of the Prose Edda book Gylfaginning, Fenrir is first mentioned in a stanza quoted from Völuspá. Fenrir is first mentioned in prose in chapter 25, where the enthroned figure of High tells Gangleri (described as King Gylfi in disguise) about the god Týr. High says that one example of Týr's bravery is that when the Æsir were luring Fenrir (referred to here as Fenrisúlfr) to place the fetter Gleipnir on the wolf. Fenrir did not trust that they would let him go until the Æsir placed Týr's hand into Fenrir's mouth as a pledge. As a result, when the Æsir refused to release him, he bit off Týr's hand at a location "now called the wolf-joint" (the wrist), causing Týr to be one-handed and "not considered to be a promoter of settlements between people"

In chapter 34, High describes Loki, and says that Loki had three children with a female jötunn named Angrboða located in the land of Jötunheimr; Fenrisúlfr, the serpent Jörmungandr, and the female being Hel. High continues that, once the gods found that these three children were being brought up in the land of Jötunheimr, and when the gods "traced prophecies that from these siblings great mischief and disaster would arise for them" the gods expected a lot of trouble from the three children, partially due to the nature of the mother of the children, yet worse so due to the nature of their father.[9]

High says that Odin sent the gods to gather the children and bring them to him. Upon their arrival, Odin threw Jörmungandr into "that deep sea that lies round all lands", and then threw Hel into Niflheim, and bestowed upon her authority over nine worlds. However, the Æsir brought up the wolf "at home", and only Týr had the courage to approach Fenrir, and give Fenrir food. The gods noticed that Fenrir was growing rapidly every day, and since all prophecies foretold that Fenrir was destined to cause them harm, the gods formed a plan. The gods prepared three fetters: The first, greatly strong, was called Leyding. They brought Leyding to Fenrir and suggested that the wolf try his strength with it. Fenrir judged that it was not beyond his strength, and so let the gods do what they wanted with it. At Fenrir's first kick the bind snapped, and Fenrir loosened himself from Leyding. The gods made a second fetter, twice as strong, and named it Dromi. The gods asked Fenrir to try the new fetter, and that should he break this feat of engineering, Fenrir would achieve great fame for his strength. Fenrir considered that the fetter was very strong, yet also that his strength had grown since he broke Leyding, yet that he would have to take some risks if he were to become famous. Fenrir allowed them to place the fetter.

When the Æsir exclaimed that they were ready, Fenrir shook himself, knocked the fetter to ground, strained hard, and kicking with his feet, snapped the fetter – breaking it into pieces that flew far into the distance. High says that, as a result, to "loose from Leyding" or to "strike out of Dromi" have become sayings for when something is achieved with great effort. The Æsir started to fear that they would not be able to bind Fenrir, and so Odin sent Freyr's messenger Skírnir down into the land of Svartálfaheimr to "some dwarves" and had them make a fetter called Gleipnir. The dwarves constructed Gleipnir from six mythical ingredients. After an exchange between Gangleri and High, High continues that the fetter was smooth and soft as a silken ribbon, yet strong and firm. The messenger brought the ribbon to the Æsir, and they thanked him heartily for completing the task.

The Æsir went out on to the lake Amsvartnir (Old Norse "pitch black"), sent for Fenrir to accompany them, and continued to the island Lyngvi (Old Norse "a place overgrown with heather"[13]). The gods showed Fenrir the silken fetter Gleipnir, told him to tear it, stated that it was much stronger than it appeared, passed it among themselves, used their hands to pull it, and yet it did not tear. However, they said that Fenrir would be able to tear it, to which Fenrir replied:

"The Binding of Fenrir" (1908) by George Wright."It looks to me that with this ribbon as though I will gain no fame from it if I do tear apart such a slender band, but if it is made with art and trickery, then even if it does look thin, this band is not going on my legs."

The Æsir said Fenrir would quickly tear apart a thin silken strip, noting that Fenrir earlier broke great iron binds, and added that if Fenrir wasn't able to break slender Gleipnir then Fenrir is nothing for the gods to fear, and as a result would be freed. Fenrir responded:

"If you bind me so that I am unable to release myself, then you will be standing by in such a way that I should have to wait a long time before I got any help from you. I am reluctant to have this band put on me. But rather than that you question my courage, let someone put his hand in my mouth as a pledge that this is done in good faith."

With this statement, all of the Æsir look to one another, finding themselves in a dilemma. Everyone refused to place their hand in Fenrir's mouth until Týr put out his right hand and placed it into the wolf's jaws. When Fenrir kicked, Gleipnir caught tightly, and the more Fernrir struggled, the stronger the band grew. At this, everyone laughed, except Týr, who there lost his right hand. When the gods knew that Fenrir was fully bound, they took a cord called Gelgja (Old Norse "fetter") hanging from Gleipnir, inserted the cord through a large stone slab called Gjöll (Old Norse "scream"), and the gods fastened the stone slab deep into the ground. After, the gods took a great rock called Thviti (Old Norse "hitter, batterer"), and thrust it even further into the ground as an anchoring peg. Fenrir reacted violently; he opened his jaws very widely, and tried to bite the gods. The gods thrust "a certain sword" into Fenrir's mouth, the hilt of the sword on Fenrir's lower gums and the point his upper gums. Fenrir "howled horribly", saliva ran from his mouth, and this saliva formed the river Ván (Old Norse "hope"). There Fenrir will lie until Ragnarök. Gangleri comments that Loki created a "pretty terrible family" though important, and asks why the Æsir did not just kill Fenrir there since they expected great malice from him. High replies that "so greatly did the gods respect their holy places and places of sanctuary that they did not want to defile them with the wolf's blood even though the prophecies say that he will be the death of Odin

In chapter 38, High says that there are many men in Valhalla, and many more who will arrive, yet they will "seem too few when the wolf comes". In chapter 51, High foretells that as part of the events of Ragnarök, after Fenrir's son Sköll has swallowed the sun and his other son Hati Hróðvitnisson has swallowed the moon, the stars will disappear from the sky. The earth will shake violently, trees will be uprooted, mountains will fall, and all binds will snap – Fenrisúlfr will be free. Fenrisúlfr will go forth with his mouth opened wide, his upper jaw touching the sky and his lower jaw the earth, and flames will burn from his eyes and nostrils. Later, Fenrisúlfr will arrive at the field Vígríðr with his brother Jörmungandr. With the forces assembled there, an immense battle will take place. During this, Odin will ride to fight Fenrisúlfr. During the battle, Fenrisúlfr will eventually swallow Odin, killing him, and Odin's son Víðarr will move forward and kick one foot into the lower jaw of the wolf. This foot will bear a legendary shoe "for which the material has been collected throughout all time". With one hand, Víðarr will take hold of the wolf's upper jaw and tear apart his mouth, killing Fenrisúlfr. High follows this prose description by citing various quotes from Völuspá in support, some of which mention Fenrir.

In the Epilogue section of the Prose Edda book Skáldskaparmál, a euhemerized monologue equates Fenrisúlfr to Pyrrhus, attempting to rationalize that "it killed Odin, and Pyrrhus could be said to be a wolf according to their religion, for he paid no respect to places of sanctuary when he killed the king in the temple in front of Thor's altar". In chapter 2, "wolf's enemy" is cited as a kenning for Odin as used by the 10th century skald Egill Skallagrímsson. In chapter 9, "feeder of the wolf" is given as a kenning for Týr and, in chapter 11, "slayer of Fenrisúlfr" is presented as a kenning for Víðarr. In chapter 50, a section of Ragnarsdrápa by the 9th century skald Bragi Boddason is quoted that refers to Hel, the being, as "the monstrous wolf's sister". In chapter 75, names for wargs and wolves are list, including both "Hróðvitnir" and "Fenrir" "Fenrir" appears twice in verse as a common noun for a "wolf" or "warg" in chapter 58 of Skáldskaparmál, and in chapter 56 of the book Háttatal. Additionally, the name "Fenrir" can be found among a list of jötnar in chapter 75 of Skáldskaparmál.

Thorwald's Cross, a partially surviving runestone erected at Kirk Andreas on the Isle of Man, depicts a bearded human holding a spear downward at a wolf, his right foot in its mouth, while a large bird sits at his shoulder. Rundata dates it to 940, while Pluskowski dates it to the 11th century. This depiction has been interpreted as Odin, with a raven or eagle at his shoulder, being consumed by Fenrir at Ragnarök. Next to the image is a depiction of a large cross and another image parallel to it that has been described as Christ triumphing over Satan. These combined elements have led to the cross as being described as "syncretic art"; a mixture of pagan and Christian beliefs.