The monastery of Penmon on Anglesey, one of the earliest Christian foundations in north Wales attributed to St Seiriol, was raided by Norse forces from Dublin. Anglesey's exposed position made it the most frequently raided part of Wales. The Welsh annals record multiple Norse attacks on Anglesey in the tenth century. The building of the current Penmon priory church dates to the post-Viking period when it was safe to build in stone again.
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