Rǫgnvaldr Eysteinsson

Rognvald Eysteinsson was the founding Jarl (or Earl) of Møre in Norway, and a close relative and ally of Harald Fairhair, the earliest known King of Norway. In the Norse language he is known as Rǫgnvaldr Eysteinsson (Mǿrajarl) and in modern Norwegian as Ragnvald Mørejarl. He is sometimes referred to with bynames that may be translated into modern English as "Rognvald the Wise" or "Rognvald the Powerful".

The earliest available sources regarding Rognvald are mutually contradictory and were compiled long after he died. The best known are the Norse Sagas, although modern scholars highlight many inconsistencies and improbable claims regarding Rognvald in the sagas, and believe that they must be treated with caution:

Modern scholars also highlight inconsistencies and improbable claims in the sagas' claims regarding: the relationship between Rognvald and Harald; the names and biographies of Rognvald's immediate family; and, the founding of the earldom of Møre.

Rognvald was the father of Torf-Einarr (d. circa 910) an earl of Orkney. Some Norse accounts claimed that another son, Hrólfr, settled in France and, under the name Rollo (d. 930), founded the Duchy of Normandy. However, French sources suggest that Rollo's father was an unnamed Danish or Norwegian nobleman, or a viking named Ketill.

Traditional accounts