Egill Skallagrímsson (c. 904 – c. 995) was a Viking-Age poet, warrior and farmer. He is also the protagonist of the eponymous Egil's Saga. Egil's Saga historically narrates a period from approximately 850 to 1000 CE and is believed to have been written between 1220 and 1240 CE.
Egill was born in Iceland, the son of Skalla-Grímr Kveldúlfsson and Bera Yngvarsdóttir, and the grandson of Kveld-Úlfr ("Night Wolf"). His ancestor, Hallbjorn, was Norwegian-Sami.
When Grímr arrived in Iceland, he settled at Borg, the place where his father's coffin landed. Grímr was a respected chieftain and mortal enemy of King Harald Fairhair of Norway.
Egill composed his first poem at the age of three years. He exhibited berserk behaviour, and this, together with the description of his large and unattractive head, has led to the theory that he might have suffered from Paget's disease. As professor Byock explains in his Scientific American article, Paget's disease causes a thickening of the bones and may lead eventually to blindness. The poetry of Egill contains clues to Paget's disease, and this is the first application of science, with the exclusion of archaeology, to the Icelandic sagas.
At the age of seven, Egill was cheated in a game with local boys. Enraged, he went home and procured an axe, and returning to the boys, split the skull to the teeth of the boy who cheated him. After Berg-Önundr refused to allow Egill to claim his wife Ásgerðr's share of her father's inheritance, he challenged Önundr to a man-to-man fight on an island or holmgang.
Later, after being grievously insulted, Egill killed Bárðr of Atley, a retainer of King Eirik Bloodaxe and kinsman of Queen Gunnhildr, both of whom spent the remainder of their lives trying to take vengeance. Seething with hatred, Gunnhildr ordered her two brothers to assassinate Egill and his brother Þórólfr, who had been on good terms with her previously. However, Egill slew the Queen's brothers when they attempted to confront him. Gunnbildr's brother's names were Eyvind Braggart and Alf Aksmann.