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The Vikings didn't just pillage and run; sometimes they came to stay. Dublin became a Viking town; so did Lincoln and York, along with much of the surrounding territory in northern and eastern England. In Scotland, Vikings maintained their language and political links to their homeland well into the 15th century. Says Batey: "The northern regions of Scotland, especially, were essentially a Scandinavian colony up until then." Vikings also created the duchy of Normandy, in what later became France, as well as a dynasty that ruled Kiev, in Ukraine.
Given their hugely profitable forays into Europe, it's not entirely clear why the Vikings chose to strike out across the forbidding Atlantic. One reason might have been a growing population; another might have been political turmoil. The search for such exotic trade goods as furs and walrus ivory might have also been a factor. The timing, in any event, was perfect: during the 9th century, when the expansion began, the climate was unusually warm and stable. Pastures were productive, and the pack ice that often clogged the western North Atlantic was at a minimum.
So westward the Vikings went. Their first stop, in about 860, was the Faeroe Islands, northwest of Scotland. Then, about a decade later, the Norse reached Iceland. Experts believe as many as 12,000 Viking immigrants ultimately settled there, taking their farm animals with them. (Inadvertently, they also brought along mice, dung beetles, lice, human fleas and a host of animal parasites, whose remains, trapped in soil, are helping archaeologists form a detailed picture of early medieval climate and Viking life. Bugs, for example, show what sort of livestock the Norse kept.)
Agriculture was tough in Iceland; it was too cold, for instance, to grow barley for that all important beverage beer. "They tried to grow barley all over Iceland, but it wasn't economical," says archaeologist Thomas McGovern of New York City's Hunter College. Nevertheless, the colony held on, and in 930 Iceland's ruling families founded a general assembly, known as the Althing, at which representatives of the entire population met annually to discuss matters of importance and settle legal disputes. The institution is still in operation today, more than a thousand years later.
In 982 the Althing considered the case of an ill-tempered immigrant named Erik the Red. Erik, the saga says, had arrived in Iceland several years earlier after being expelled from Norway for murder. He settled down on a farm, married a Christian woman named Thjodhild (the Norse were by now starting to convert) and had three sons, Leif, Thorvald and Thorstein, and one daughter, Freydis. It wasn't long, though, before Erik began feuding with a neighbor something about a cow and some wallboards and ended up killing again.