Hallbjorn Halftroll or Hallbjorn Ulfsson was an early ninth century Norwegian hersir. He was the father of Ketil Trout of Hrafnista. He is mentioned in the Ketils saga hœngs as well as Egils saga and the Landnámabók. He was likely Norwegian-Sami.[1]
- ^ Pálsson, Hermann. "The Sami People in Old Norse Literature." Nordlit 3.1 (2012): 29-53. "The following nouns were used about people of mixed parentage:".."halftroll 'a half troll'. This is used as the nickname of Hallbjorn of Ramsta in Namdalen, father of Ketill hoengr, and ancestor of some of the settlers of Iceland, including Skalla-Grimr."