The name Ragnhild Sigurdsdotter may refer to two different figures from Old Norse literature, an amalgam of them, or a purely fictitious figure.The wife of Halfdan the Elder A woman who lived during the late 9th and/or early 10th centuries, who was the daughter of Sigurd Hart of the Dagling clan.

Harald Fairhair was a Norwegian king. According to traditions current in Norway and Iceland in the eleventh and twelfth centuries, he reigned from c. 872 to 930 and was the first King of Norway. Supposedly, two of his sons, Eric Bloodaxe and Haakon the Good, succeeded Harald to become kings after his death.