The Battle of Clontarf occurs near Dublin, Ireland, where the forces of Brian Boru, the High King of Ireland, defeat the Viking invaders. While Brian Boru's forces were victorious, the battle resulted in significant casualties, including Brian Boru himself. The battle is often seen as a pivotal moment in Irish history, marking a decline in Viking power in Ireland and contributing to the eventual unification of the country.
Battle of Clontarf, oil on canvas painting by Hugh Frazer, 1826