The Age of the Sturlungs or the Sturlung Era (Icelandic: Sturlungaöld) was a 42–44 year period of internal strife in mid-13th century Iceland. It may have been the bloodiest and most violent period in Icelandic history. It is documented in the Sturlunga saga.
This period is marked by the conflicts of powerful chieftains, goðar, who amassed followers and did battle, and is named for the Sturlungs, the most powerful family clan in Iceland at the time. At the end of the era, the Icelandic Commonwealth ceased to exist and Iceland became a vassal of Norway.
Historians generally regard the year 1220 as the first year of the Age of the Sturlungs, although some wish to place its beginning at an earlier date because of the Battle of Víðines. Power in the country had consolidated within the grasp of a few family clans. They were:
At this time, Hákon the Old, King of Norway, was trying to extend his influence in Iceland. Many Icelandic chieftains became his vassals and were obliged to do his bidding—in exchange they received gifts, followers and a status of respect. Consequently, the greatest Icelandic chieftains were soon affiliated with the King of Norway in one way or the other.
In the Icelandic Commonwealth, power was mostly in the hands of the goðar (local chieftains). Iceland was effectively divided into farthings (quarters). Within each farthing were nine Goði-dominions ("Goðorð"). The North farthing had an additional three dominions due to its size. All in all they were 39.
The Goði-chieftains protected the farmers in their territory, and exacted compensation or vengeance if their followers' rights were violated. In exchange, the farmers pledged their support to the Goði, both by voting in his favor in the Alþingi parliament and (if needed) by taking up arms against his enemies.