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Diarmait Mac Murchada, anglicized as Dermot MacMurrough, King of Leinster, was defeated and exiled by a group of enemies. He fled to Normandy and appealed to the King Henry II of England for help in getting his kingdom back. Henry gave the aid, and Leinster was retaken in short order.

The problem with all this was that Norman knights had gone into Ireland to help the King of Leinster, and Henry was worried that they would eventually set up their own independent Norman kingdom in Ireland. So he went to Ireland to get some control over the situation. The kings of a number of Irish kingdoms acknowledged Henry as an overlord as a way to curb the power of Leinster, and the Norman knights he brought along set up residence in Ireland as well.

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14y ago

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