Civil War and the end of the Commonwealth
During the 11th and 12th centuries, the centralization of power had worn down the institutions of the Commonwealth, as the former, notable independence of local farmers and chieftains gave way to the growing power of a handful of families and their leaders.
In 930, the ruling chiefs established an assembly called the Alţingi (Althing). The parliament convened each summer at Ţingvellir, where representative chieftains (Gođorđsmenn or Gođar) amended laws, settled disputes and appointed juries to judge lawsuits.
Ingólfur was followed by many more Norse chieftains, their families and slaves who settled all the inhabitable areas of the island in the next decades. These people were primarily of Norwegian, Irish and Scottish origin, the Irish and Scots being mainly slaves and servants of the Norse chiefs according to the Icelandic sagas and Landnámabók and other documents.
The first permanent settler in Iceland is usually considered to have been a Norwegian chieftain named Ingólfur Arnarson. According to the story, he threw two carved pillars overboard as he neared land, vowing to settle wherever they landed. He then sailed along the coast until the pillars were found in the southwestern peninsula, now known as Reykjanesskagi.
According to Landnámabók, Iceland was discovered by Naddoddr, one of the first settlers on the Faroe Islands, who was sailing from Norway to the Faroe Islands, but got lost and drifted to the east coast of Iceland. Naddoddr named the country Snćland (Snowland).
In geological terms, Iceland is a young island. It started to form about 20 million years ago from a series of volcanic eruptions on the Mid-Atlantic Ridge. The Iceland hotspot is likely partly responsible for the island's creation and continued existence.
