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.
Viking raid warfare and tactics
The Vikings were also able to establish an extended period of economic and political rule of much of Ireland, England, and Scotland during the Norse Ivarr Dynasty that started in the late 9th century and lasted until 1094. In Ireland, coastal fortifications known as longphorts were established in many places after initial raidings, and they developed into trading posts and settlements over time. Quite a few modern towns in Ireland were founded in this way, including Dublin.