In Saxo
In the late and legend-influenced Gesta Danorum of Saxo Grammaticus, Hardakanute appears as Knut. He is described as a son of Erik, a descendent of Ragnar Lodbrok, by Gudorm, the granddaughter of Harald Klak. In his version of the tale, Hardakanute is raised by Ennignup (suggested to be Saxo's rendition of Gnupa), but never accepts Christianity.
Read more about this topic: Harthacnut I Of Denmark