late 800's - 921

Ragnall mac Bárid ua Ímair (Rægnald or Rǫgnvaldr) was a Viking leader who ruled Northumbria and the Isle of Man in the early 10th century. He was a grandson of Ímar and a member of the Uí Ímair. Ragnall was most probably among those Vikings expelled from Dublin in 902, whereafter he may have ruled territory in southern Scotland or the Isle of Man. In 917, he and his kinsman Sitric Cáech sailed separate fleets to Ireland where they won several battles against local kings. Sitric successfully recaptured Dublin and established himself as king, while Ragnall returned to England. He fought against Constantín mac Áeda, King of Scotland, in the Battle of Corbridge in 918, and although the battle was not decisive it did allow Ragnall to establish himself as king at York.