Gylfaginning is the first main part of the 13th century Prose Edda, after the initial Prologue. The Gylfaginning takes the form of a dialogue between a Swedish King Gylfi and three men on thrones in Asgard called High, Just-As-High, and Third. Gylfi asks many questions of the three men on the history and future of the Æsir. The creation and eventual destruction of the world are described, as are many other aspects of Norse mythology. While the Gylfaginning never makes it explicit, the three are often presumed to be guises of Odin.
The terms Jötunheimr or Jötunheimar refer to either a land or multiple lands respectively in Nordic mythology inhabited by the jötnar. Jötunheimar are typically, but not exclusively, presented in Eddic sources as prosperous lands located to the north and are commonly separated from the lands inhabited by gods and humans by barriers that cannot be traversed by usual means.
In Norse cosmology, Niflheim or Niflheimr is a location which sometimes overlaps with the notions of Niflhel and Hel. The name Niflheimr appears only in two extant sources: Gylfaginning and the much-debated Hrafnagaldr Óðins.
In Norse mythology, Nástrǫnd is a place in Hel where Níðhöggr lives and chews on corpses. It is the afterlife for those guilty of murder, adultery, and oath-breaking.
The Prose Edda, also known as the Younger Edda, Snorri's Edda or, historically, simply as Edda, is an Old Norse textbook written in Iceland during the early 13th century. The work is often considered to have been to some extent written, or at least compiled, by the Icelandic scholar, lawspeaker, and historian Snorri Sturluson c. 1220. It is considered the fullest and most detailed source for modern knowledge of Norse mythology, the body of myths of the North Germanic peoples, and draws from a wide variety of sources, including versions of poems that survive into today in a collection known as the Poetic Edda.
In Norse mythology, Níðhöggr is a dragon who gnaws at a root of the world tree, Yggdrasil. In historical Viking society, níð was a term for a social stigma, implying the loss of honor and the status of a villain. Thus, its name might refer to its role as a horrific monster in its action of chewing the corpses of the inhabitants of Náströnd: those guilty of murder, adultery, and oath-breaking.
In Norse mythology, Váli is a god and the son of the god Odin and the female jötun Rindr. Váli has numerous brothers including Thor, Baldr, and Víðarr. He was born for the sole purpose of avenging Baldr, and does this by killing Höðr, who was an unwitting participant, and binding Loki with the entrails of his son Narfi. Váli grew to full adulthood within one day of his birth, and slew Höðr before going on to Loki. He is prophesied to survive Ragnarök.
In Norse mythology, Elli is a personification of old age who, in the Prose Edda book Gylfaginning, defeats Thor in a wrestling match.
Þökk is a jötunn in Norse mythology, presumed to be Loki in disguise, who refuses to weep for the slain Baldr, thus forcing Baldr to stay in Hel.
Hymir is a jötunn in Norse mythology, and the owner of a brewing-cauldron fetched by the thunder god Thor for Ægir, who wants to hold a feast for the Æsir (gods). In Hymiskviða, Hymir is portrayed as the father of Týr, but in Skáldskaparmál, Odin is Týr's father.
In Norse mythology, Jörmungandr, also known as the Midgard Serpent or World Serpent, is an unfathomably large sea serpent or worm who dwells in the world sea, encircling the Earth (Midgard) and biting his own tail, an example of an ouroboros. As a result of it surrounding Midgard it is referred to as the World Serpent. When it releases its tail, Ragnarök will begin.
In Norse mythology, Útgarða-Loki is the ruler of the castle Útgarðr in Jötunheimr. He is one of the jötnar and his name means literally "Loki of the Outyards" or "Loki of the Outlands", to distinguish him from Loki, the companion of Thor. He was also known as Skrýmir or Skrymir.
In Norse mythology, Borr or Burr was the son of Búri. Borr was the husband of Bestla and the father of Odin, Vili and Vé. Borr receives mention in a poem in the Poetic Edda, compiled in the 13th century from earlier traditional material, and in the Prose Edda, composed in the 13th century by Icelander Snorri Sturluson. Scholars have proposed a variety of theories about the figure.
In some versions of Norse mythology, Váli was one of the sons of Loki. He is mentioned in the Gylfaginning section of Snorri Sturluson's Prose Edda, chapter 50. After the death of Baldr, the Æsir chase down and capture Loki; in this version it is an unnamed god rather than Váli, son of Loki, who binds Loki with his son's entrails:
In Norse mythology, Barri is the place where Freyr and Gerðr are to consummate their union, as stated in the Skírnismál:
In Norse mythology, Sindri is the name of both a dwarf and a hall that will serve as a dwelling place for the souls of the virtuous after the events of Ragnarök. Sindri is also referred to as Eitri, the brother of Brokkr.
In Norse mythology, Járnviðr is a forest located east of Midgard, inhabited by trollwomen who bore jötnar and giant wolves. Járnviðr is attested in the Poetic Edda, compiled in the 13th century from earlier traditional sources, and the Prose Edda, written in the 13th century by Snorri Sturluson.
In Norse mythology, Singasteinn is an object that appears in the account of Loki and Heimdall's fight in the form of seals. The object is solely attested in the skaldic poem Húsdrápa. Some scholars have interpreted it as the location of the struggle, others as the object they were struggling over.
Hárr, Jafnhárr, and Þriði are three men on thrones who appear in the Prose Edda in the Gylfaginning, one of the oldest and most important sources on Norse mythology. Their names translate as High, Just-as-High, and Third in Old Norse, respectively. In the story, King Gylfi, calling himself Gangleri, engages in a test of wisdom with the three, asking them detailed questions about the Æsir, their deeds, and their future. The three respond until the final segment, in which the three men and the great hall suddenly disappear.
In Norse mythology, Narfi is a son of Loki, referred to in a number of sources. According to the Gylfaginning section of Snorri Sturluson's Prose Edda, he was also called Nari and was killed by his brother Váli, who was transformed into a wolf; in a prose passage at the end of the Eddic poem "Lokasenna", Narfi became a wolf and his brother Nari was killed.
