Vikings in Iberia
Viking activity in the Iberian peninsula seems to have begun around the mid-ninth century as an extension of Viking raids on and establishment of bases in Frankia in the earlier ninth century. While connections between the Norse and Eastern Islamic lands were well-established, particularly involving the Rus') along the Volga and around the Caspian Sea, relations with the Western edge of Islam were more sporadic and haphazard. Although Vikings may have over-wintered in Iberia, no evidence has been found for trading or settlement. Indeed, the Iberian peninsula may not have offered particularly wealthy targets, in the ninth to tenth centuries. Sporadic raiding continued until the end of the Viking Age.
Vikings
A consequence of the available written sources, which may have coloured how the Viking age is perceived as a historical period, is that much more is known of the Vikings' activities in western Europe than in the East. One reason is that the cultures of north-eastern Europe at the time were non-literate, and did not produce a legacy of literature. Another is that the vast majority of written sources on Scandinavia in the Viking Age come from Iceland, a nation originally settled by Norwegian colonists. As a result, there is much more material from the Viking Age about Norway than Sweden, which apart from many runic inscriptions, has almost no written sources from the early Middle Ages.