Commonwealth (c. 930–1262)
At the time of Iceland’s settlement, Norse people worshiped gods whom they called æsir (singular áss), and this religion left behind an extensive mythology in Icelandic literature. Thor seems to have been the most popular of the pagan gods in Iceland, although Odin is thought to have been the highest in rank. It appears that heathen worship was organized around a distinct class of chieftains called godar (singular godi), of which there were about 40. In the absence of royal power in Iceland, the godar were to form the ruling class in the country.
By the end of the settlement period, a general Icelandic assembly, called the Althing, had been established and was held at midsummer on a site that came to be called Thingvellir. This assembly consisted of a law council (lögrétta), in which the godar made and amended the laws, and a system of courts of justice, in which householders, nominated by the godar, acted on the panels of judges. At the local level, three godar usually held a joint assembly in late spring at which a local court operated, again with judges nominated by the godar. All farmers were legally obliged to belong to a chieftaincy (godord) but theoretically were free to change their allegiance from one godi to another; the godar were allotted a corresponding right to expel a follower. Some scholars have seen in this arrangement a resemblance to the franchise in modern societies. On the other hand, there was no central authority to ensure that the farmers would be able to exercise their right in a democratic way. No one was vested with executive power over the country as a whole. In any case, no trace of democratic practice reached farther down the social scale than to the heads of farming households; women and workers (free or enslaved) had no role in the political system.
Christianization
By the end of the 10th century, the Norwegians were forced by their king, Olaf I Tryggvason, to accept Christianity. The king also sent missionaries to Iceland who, according to 12th-century sources, were highly successful in converting the Icelanders. In 999 or 1000 the Althing made a peaceful decision that all Icelanders should become Christians. In spite of this decision, the godar retained their political role, and many of them probably built their own churches. Some were ordained, and as a group they seem to have closely controlled the organization of the new religion. Two bishoprics were established, one at Skálholt in 1056 and the other at Hólar in 1106. Literate Christian culture also transformed lay life. Codification of the law was begun in 1117–18. Later the Icelanders began to write sagas, which were to reach their pinnacle of literary achievement in the next century.
Economic life
Historians believe that early Icelandic society was prosperous. The country proved to be well suited for sheep and cattle, and both were raised for meat and milk. The sheep also yielded wool, and homespun cloth became the chief export. There was some agriculture, but grain was always imported. Timber was also imported; the only indigenous wood was birch. However abundant driftwood may have been, it could not satisfy the needs of the whole population. The Icelanders built large turf-clad houses on bulky timber frames, and some of the churches were built entirely of timber.
In spite of the seeming abundance, the end was coming for an independent Icelandic commonwealth. In Norway royal power gained strength in the early 13th century when the king set out to unite all Norwegian Viking Age settlements under his reign. By that time about 10 powerful godar, belonging to some five families, held almost all the chieftaincies in Iceland, and by mid-century these chieftaincies were engaged in a bloody struggle for power. Finally, in 1262–64, all Icelandic chieftains and representatives of the farmers were persuaded to swear allegiance to the king of Norway, partly in the hope that he would bring peace to the country.