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In Gesta Danorum, which was written to glorify the past of the Danish nation, Helgi Saxo appears to have mixed Helgi Hundingbane with the Danish king Halga, as he claims that Helgi killed a Swedish king named Hunding. Hothbrodd was made a Swedish king and given Ohthere's position in the line. Because of this the Danish scholar Bugge tried, in 1896, to connect him to the Skjöldung Helgi.
Due to this modification, Helgi's residence Hringstaðir is occasionally interpreted as the Danish Ringsted. Others have remarked that, in the Norse sagas the Ylfings are never called Danish, and the only territory that they are said to have ruled is East Götaland. In the first poem (Helgakviða Hundingsbana I), Sinfjotle has his residence on the Bravellir (the plain west of Bråviken in East Götaland, see Battle of Bråvalla) and Helgi resides at Hringstaðir (probably modern Ringstad, an old royal estate on the same plain existing well before, and during, the 7th century).
Moreover, in the Heimskringla, their enemy Granmar (the father of Hothbrodd) was the king of Södermanland, which is adjacent to East Götaland, and not of Sweden.
Read more about this topic: Helgi Hundingsbane