Holtsmark published several translations from Old Norse into Norwegian: Heimskringla (with Didrik Arup Seip, two volumes, 1934); the Prose Edda (1950); Helgisaga Óláfs konungs Haraldssonar (1956); Sverris saga (1961), Hákonar saga Hákonarsonar (1964); and Orkneyinga saga (1970).
The marriage of "Eithne, daughter of King Kjarval of Ireland" and Hlodvir Thorfinnsson, Earl of Orkney is reported in the Orkneyinga saga and Earl Sigurd the Stout, who was killed at the battle of Clontarf is called their son.
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However, earlier Scandinavian sources (notably the Orkneyinga saga, Njál's saga and the Darraðarljóð, composed soon after the battle) contend that he did actually fight valiantly at Clontarf.
In the Orkneyinga saga (13th century), Þorri is an early Norwegian king, the son of Snær ('Snow') the Old, a descendant of Fornjót, an ancient king of Finland, Kvenland and Gotland.