 Several Scottish clans that were historically seated on Lewis have traditionally been ascribed a descent from Óláfr . The MacLeods claim a descent from Leod ( Old Norse Ljótr ) , who is popularly said to have been a son of Óláfr . Clan traditions dating to the late 18th century link Leod with Óláfr , and heraldic evidence dating to the late 17th century may be the earliest indication of such a claim ; however , recent research into the MacLeods ' traditional ancestry has determined such claims of descent from Óláfr are unsupportable . Other Lewis clans have been linked with Óláfr in various traditions , such as the Morrisons of Ness and their adversaries the Macaulays of Uig , although there is no supporting evidence that Óláfr left any descendants on the island . 
