Norse fleets struck the north Welsh coast around 850 in the first sustained wave of Viking raiding on Wales. The Annals of Wales record Norse activity along the Gwynedd coast. The monasteries of Bangor and Caernarfon area were prime targets. These early raids preceded the better-documented attacks of 853 and 856. Norse sea power in the Irish Sea was increasing rapidly in this decade as Dublin grew into a major Viking base.
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