According to the ancient manuscript Landnámabók, the settlement of Iceland began in 874 AD when the Norwegian chieftain Ingólfr Arnarson became the first permanent settler on the island. In the following centuries, Norwegians, and to a lesser extent other Scandinavians, emigrated to Iceland, bringing with them thralls (i.e., slaves or serfs) of Gaelic origin. The island was governed as an independent commonwealth under the Althing, one of the world's oldest functioning legislative assemblies. Following a period of civil strife, Iceland acceded to Norwegian rule in the 13th century. The establishment of the Kalmar Union in 1397 united the kingdoms of Norway, Denmark, and Sweden. Iceland thus followed Norway's integration into that union, coming under Danish rule after Sweden's secession from the union in 1523. Although the Danish kingdom introduced Lutheranism forcefully in 1550, Iceland remained a distant semi-colonial territory in which Danish institutions and infrastructures were conspicuous by their absence. In the wake of the French Revolution and the Napoleonic Wars, Iceland's struggle for independence took form and culminated in independence in 1918 and the founding of a republic in 1944. Until the 20th century, Iceland relied largely on subsistence fishing and agriculture, and was among the poorest countries in Europe. Industrialisation of the fisheries and Marshall Plan aid following World War II brought prosperity and Iceland became one of the wealthiest and most developed nations in the world. In 1994, it became a part of the European Economic Area, which further diversified the economy into sectors such as finance, biotechnology, and manufacturing.
The Sagas of Icelanders say that a Norwegian named Naddodd (or Naddador) was the first Norseman to reach Iceland, and in the 9th century he named it Snæland or "snow land" because it was snowing. Following Naddodd, the Swede Garðar Svavarsson arrived, and so the island was then called Garðarshólmur which means "Garðar's Isle".
Then came a Viking named Flóki Vilgerðarson; his daughter drowned en route, then his livestock starved to death. The sagas say that the rather despondent Flóki climbed a mountain and saw a fjord (Arnarfjörður) full of icebergs, which led him to give the island its new and present name. The notion that Iceland's Viking settlers chose that name to discourage oversettlement of their verdant isle is a myth.