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5th century in Ireland

5th century

Possible year of death of Niall Noígíallach. The Annals of the Four Masters dates his accession to 378 and death to 405. The chronology of Keating's Foras Feasa ar Éirinn broadly agrees, dating his reign from 368-395, and associating his raiding activities in Britain with the kidnapping of Saint Patrick. However, the traditional roll of kings and its chronology is now recognised as artificial. The High Kingship did not become a reality until the 9th century, and Niall's legendary status has been inflated in line with the political importance of the dynasty he founded. Based on Uí Néill genealogies and the dates given for his supposed sons and grandsons, modern historians believe he is likely to have lived some 50 years later than the traditional dates, dying circa 450.

At about this date, with the end of Roman rule in Britain, raiders from Ireland such as the Uí Liatháin and Laigin harry the coasts of Britain. They plunder towns and capture slaves but later colonise large areas of Gwynedd, in particular the Llyn Peninsula, the coasts of Arllechwedd and Arfon and Anglesey.