 "Egil's Saga" mentions a son named Rögnvald, but it is not known whether he can be identified with one of those mentioned in "Heimskringla", or even whether he was Gunnhild's son or Erik's by another woman.Gunnhild was widely reputed to have or otherwise employ magical powers.Prior to the death of Harald Fairhair, Erik's popular half-brother Halfdan Haraldsson the Black died mysteriously, and Gunnhild was suspected of having "bribed a witch to give him a death-drink."