I know what the Normans were. They were also of French blood as well. The Vikings in Normandy married Frenchwomen. Ireland didn't have cities in Dark Age times, so the Vikings founded Ireland's cities, but those were taken over by the Irish and by the British invaders. In England, the English had many conflicts with the Vikings and at different times different groups were the winners. The biggest Viking influx into England was in King Alfred the Great's time and he and his children defeated them, but a large area of England was left under the control of Vikings who owed ultimate allegiance to the English king. In Ireland, the Vikings made much less headway and were absorbed better.