While the poet of Beowulf does not locate the Wulfings geographically, Scandinavian sources define the Ylfings (the Old Norse form of the name) as the ruling clan of the Eastern Geats.
The Danish king Hroðgar, who was married to Wealhþeow, a Wulfing woman, graciously paid the weregild, and when Beowulf arrived at the Danish court in order to slay Grendel, Hroðgar interpreted this as a son's gratitude.
In Old Norse sources, the clan figure prominently in the Heimskringla and in Sögubrot, where Hjörvard and his son Hjörmund belong to it.
Sam Newton and others (including Rupert Bruce-Mitford), have proposed that the East Anglian Wuffing dynasty was derived from the Wulfings, and it was at their court that Beowulf was first composed.
Stanza 42: Helgi Hundingsbane resides at Hringstaðir (probably modern Ringstad, an old royal estate on the same plain).