In Norse mythology, Gjallarhorn (Old Norse: [ˈɡjalr̩horn], "yelling horn" or "the loud sounding horn") is a horn associated with the god Heimdallr and the wise being Mímir. Gjallarhorn is attested in the Poetic Edda, compiled in the 13th century from earlier traditional material, and the Prose Edda, written in the 13th century by Snorri Sturluson.
In the Prose Edda, Gjallarhorn is mentioned thrice, and all three mentions occur in Gylfaginning. In chapter 14, the enthroned figure Just-As-High tells the disguised Gangleri about the cosmological tree Yggdrasil. Just-As-High says that one of the three roots of Yggdrasil reaches to the well Mímisbrunnr, which belongs to Mímir, and contains much wisdom and intelligence. Using Gjallarhorn, Heimdallr drinks from the well and thus is himself wise.
In chapter 25 of Gylfaginning, High tells Gangleri about Heimdallr. High mentions that Heimdallr is the owner of the "trumpet" (see footnote) Gjallarhorn and that "its blast can be heard in all worlds". In chapter 51, High foretells the events of Ragnarök. After the enemies of the gods will gather at the plain Vígríðr, Heimdallr will stand and mightily blow into Gjallarhorn. The gods will awake and assemble together at the thing.
A figure holding a large horn to his lips and clasping a sword on his hip appears on a stone cross from the Isle of Man. Some scholars have theorized that this figure is a depiction of Heimdallr with Gjallarhorn.
A 9th or 10th century Gosforth Cross in Cumbria, England depicts a figure holding a horn and a sword standing defiantly before two open-mouthed beasts. This figure has been oft theorized as depicting Heimdallr with Gjallarhorn.
Theories and interpretations
Scholar Rudolf Simek comments that the use of a horn as both a musical instrument and a drinking vessel is not particularly odd, and that the concept is also employed with tales of the legendary Old French hero Roland's horn, Olifant. Simek notes that the horn is among the most ancient of Germanic musical instruments, along with lurs, and, citing archaeological finds (such as the 5th century Golden Horns of Gallehus from Denmark), comments that there appears to have been sacral horns kept purely for religious purposes among the Germanic people; understood as earthly versions of Heimdallr's Gjallarhorn, reaching back to the early Germanic Iron Age.
- The Snoldelev Stone, a 9th-century runestone featuring a unique three-horned symbol.
- The Minnesota Vikings, an NFL American Football team based in Minneapolis, use a large horn called the Gjallarhorn during home games at the U.S. Bank Stadium. It is blown during the opening ceremony alongside the Skol, Vikings fight song.
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- Orchard (1997:57).
- Simek (2007:110).
- Faulkes (1995:17).
- Faulkes (1995:25). Lindow (2002:143) comments that the Old Norse term employed for the instrument refers to "a long brass instrument that would answer today to an unvalved trumpet".
- Faulkes (1995:54).
- Lindow (2002:168).
- Bailey (1996:86-90).
- Simek (2007:110—111).
- Bellows, Henry Adams (1923). The Poetic Edda. American-Scandinavian Foundation.
- Faulkes, Anthony (Trans.) (1995). Edda. Everyman. ISBN 0-460-87616-3
- Bailey, Richard N. (1996). England's Earliest Sculptors. University of Toronto. ISBN 0-88844-905-4.
- Larrington, Carolyne (Trans.) (1999). The Poetic Edda. Oxford University Press. ISBN 0-19-283946-2
- Lindow, John (2002). Norse Mythology: A Guide to the Gods, Heroes, Rituals, and Beliefs. Oxford University Press. ISBN 0-19-515382-0
- Orchard, Andy (1997). Dictionary of Norse Myth and Legend. Cassell. ISBN 0-304-34520-2
- Thorpe, Benjamin (Trans.) (1866) The Elder Edda of Saemund Sigfusson. Norrœna Society.
- Schach, Paul (1985). "Some Thoughts on Völuspá" as collected in Glendinning, R. J. Bessason, Heraldur (Editors). Edda: a Collection of Essays. University of Manitoba Press. ISBN 0-88755-616-7
- Simek, Rudolf (2007) translated by Angela Hall. Dictionary of Northern Mythology. D.S. Brewer ISBN 0-85991-513-1
- Zoëga, Geir (1910). A Concise Dictionary of Old Icelandic. Oxford University Press. ISBN 0-48643-431-1
• Bungie Studios, Destiny (2014). The exotic Rocket launcher Gjallarhorn.