[1] The genealogical work Hversu Noregr byggdist gives his father as Harald the Old, his grandfather as Valdar and his great-grandfather as Hróarr (i.e. the Hroðgar of Beowulf).
He mustered a large army and approached Ingjald and his daughter at a place in Svithiod called Ræning.
Seeing themselves unable to fight the Scanians, the two committed suicide by burning themselves to death inside the hall.
[5] However, another source, Hversu Noregr byggdist, gives the name of Halfdan's mother, spouse of Harald the Old, as Hervor, daughter of Heiðrekr.
[8] Sögubrot, a fragmentary saga of some legendary Swedish and Danish kings, mentions that Halfdan was the overlord of Northumbria, as were his descendants Ivar Vidfamne and Harald Wartooth after him.