Viking Age by a Viking leader called Bagsecg and his five earls. Aided by the Great Heathen Army (which had already overrun much of England from its base in Jorvik), Bagsecg's forces, and Halfdan's forces (through an alliance), the combined Viking forces raided much of England until 871, when they planned an invasion of Wessex. On 8 January 871, Bagsecg was killed at the Battle of Ashdown along with his earls. As a result, many of the Vikings returned to northern England, where Jorvic had become the centre of the Viking kingdom, but Alfred of Wessex managed to keep them out of
Danes (Germanic tribe) fortified trade settlements, so called longphorts. During the Viking Age, they established many coastal towns including Dublin (Dyflin), Cork, Waterford (Veðrafjǫrðr) and Limerick (Hlymrekr) and Danish settlers followed. There were many small skirmishes and larger battles with the native Irish clans in the following two centuries, with the Danes sometimes siding with allied clans. In 1014 AD, at the Battle of Clontarf, the Vikings were eventually defeated and the remaining Danish settlers gradually assimilated with the Irish population. The first Vikings appeared in Frisia, now part of the Netherlands and Germany, in 800 AD, when Danes plundered coastal settlements and