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Viking Invasions of Ireland
795–1014 CE
Scandinavian raiders began attacking Irish religious and coastal sites in the late eighth century. Permanent bases and towns developed at Dublin, Waterford, Limerick, Wexford and other locations.
Norse rulers became participants in Irish dynastic politics, sometimes fighting Irish kings and sometimes forming alliances with them. Trade, intermarriage and military service created a complex Hiberno-Norse society.