 His father was the Hiberno-Norse warlord Ingjald Helgasson.Some traditional sources portray Olaf as a descendant of Ragnar Lodbrok – for instance, the "Eyrbyggja Saga", claims that Olaf's paternal grandmother (Thora) was a daughter of Ragnar's son Sigurd Snake-in-the-Eye.However, this connection seems unlikely, given that Sigurd appears to have lived in the mid-9th Century and Ragnar himself may have lived until the 860s.