Gofraid ua Ímair

Gofraid ua Ímair or Guthfrith of Ivar (Old Norse: Guðrøðr [ˈɡuðˌrøðz̠], Latin: Guthfridus, fl. from AD 918 until death in 934) was a Hiberno-Scandinavian (people of Gaelic and Scandinavian birth and Culture) and Viking leader who ruled Dublin and briefly Viking Northumbria in the early 10th century. He was a grandson of Ímar and a member of the Uí Ímair. Gofraid was most probably among those Vikings expelled from Dublin in 902, whereafter he helped his kinsman Ragnall conquer Northumbria. Another kinsman, Sitric Cáech, became ruler of Dublin around the same time. Ragnall died in 920, and so the following year Sitric left Dublin to rule in Northumbria, and Gofraid succeeded Sitric as ruler of Dublin. Sitric's early reign was marked by raids he conducted against the Gaelic (Native-Irish), including one at Armagh.

Sitric Cáech died in 927 and Gofraid left for Northumbria, delegating authority in Dublin to his sons. This upset the sons of Sitric, who allied with a "son of Helgi", possibly Tomrair mac Ailchi of Limerick, and seized the city. This act began a period of conflict between the Hiberno-Scandinavian of Dublin and Limerick which would last until 937. Gofraid's attempt to rule in Northumbria was unsuccessful and he was driven out by Æthelstan of England within six months. He returned to Dublin to eject the sons of Sitric and continued to rule as king there. Following his return he led further raids, including attacks on Kildare and Dunmore Cave. In 931 he led an attack on a camp established by the Hiberno-Scandinavian of Limerick at Mag Raigne, near the borders of Gofraid's kingdom, with the intent of containing Gofraid's power. Gofraid died of a sickness in 934 and he was succeeded as king by his son Amlaíb mac Gofraid.