Rognvald Eysteinsson
Rognvald "The Wise" Eysteinsson (son of Eystein Ivarsson) is the founder of the Earldom of Orkney in the Norse Sagas. Three quite different accounts of the creation of the Norse earldom on Orkney and Shetland exist. The best known is that found in the Heimskringla, but other older traditions are found in the Historia Norvegiae and the Fragmentary Annals of Ireland.
Read more about Rognvald Eysteinsson: Sagas, Historia Norvegiae, Fragmentary Annals of Ireland, Orkney Inheritance