Gunnlaugr was born ca. 983. From an early age he proved himself impetuous, audacious, brave, and tough. He was also a skilled author of mostly derogatory poems, which earned him the cognomen ormstunga, "serpent's tongue". After a quarrel with his father, Illugi, Gunnlaugr left his home at the age of twelve to stay for some time at Borg with Þorsteinn Egilsson, the son of Egill Skallagrímsson. There, he became acquainted with Þorsteinn's daughter, Helga the fair, reputedly the most beautiful woman in Iceland. Her hair was so ample that she could hide herself in it.
When Gunnlaugr was eighteen, he went abroad. At that time, Helga became his fiancée, on the condition that she would wait no more than three years for Gunnlaugr. He visited the courts of Norway, Ireland, Orkney and Sweden and England. In Sweden, he visited the court of King Óláfr Skötkonung where he met his rival, the Icelandic champion and skald, Hrafn Önundarson.
Gunnlaugr's stay in the service of King Æthelred of England delayed his return to Iceland and Helga. He did not return until four years had passed (ca. 1005). Since Gunnlaugr had been gone longer than his allotted three years, Helga was forced into an unhappy marriage to Gunnlaugr's rival, Hrafn Önundarson. Gunnlaugr and Hrafn met at the Althing and Gunnlaugr challenged Hrafn to a duel of honour, a Holmgang (hólmganga). The duel ended in a draw and was the last one allowed in Iceland. From that time hólmganga were forbidden by Icelandic law.
In order to settle their dispute in blood, the two champions met in Norway in the spring of 1008. There, Gunnlaugr defeated Hrafn, but was fatally wounded. After a short time he died. He was 25. Helga later remarried, but never recovered from Gunnlaugr's death. Her greatest pleasure was to rest her eyes on a sumptuous coat that Gunnlaugr had given her. One evening, she rested her head on her husband's shoulder, spread the coat in front of her, and watched it for a while. Thereafter, she fell back into her husband's embrace and was dead.
- "Gunnlaugr Ormstunga (Iceland, 983 – 1008)". Writers History. 2008. Retrieved October 11, 2015.
- Knut Ødegård (February 14, 2009). "Gunnlaug Ormstunge". Store norske leksikon. Retrieved October 19, 2015.
- "Lausavísur (Hrafn Önundarson)". Heimskringla.no. Retrieved October 19, 2015.
- Randolph Quirk (translator), Peter G. Foot (editor) (1957). "Gunnlaugs Saga Ormstungu" (PDF). Thomas Nelson and Sons, Ltd. Retrieved October 11, 2015.
- "Romeo and Juliet of The North: Gunnlaugs saga ormstungu". The Saga-Steads of Iceland: A 21st-Century Pilgrimage. September 25, 2011. Retrieved October 19, 2015.
- Whaley, Diana (2002) Sagas of Warrior-Poets (Penguin) ISBN 978-0140447712
- Hreinsson, Vidar (1997) The Complete Sagas of Icelanders (Leifur Eiriksson Publishing) ISBN 978-9979929307
- "The Saga of Gunnlaug the Worm-Tongue and Rafn the Skald" 1901 English Translation by William Morris and Eiríkr Magnússon
- Article from Nordisk Familjebok (in Swedish) on Projekt Runeberg.