Olaf was born around 820, in
Ireland. 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. Irish fragments provide a different genealogy, suggesting that Olaf's father was Godfred, son of Ragnall, son of Godfred, son of Godfred. He was named
King of Dublin around 853. According to Irish sources, Olaf ruled jointly with his kinsman
Ímar. Olaf married
Aud the Deep-minded (
Auðr), daughter of
Ketil Flatnose, the ruler of the
Hebrides, according to Icelandic traditions (
Landnámabók,
Laxdæla saga). The Irish sources name Olaf's wife only as the daughter of a "King Aedh". Olaf and Auðr had a son,
Thorstein the Red (
Þorsteinn rauðr), who attempted to conquer
Scotland in the 870s. At some point Olaf had a falling-out with the clan of Ketil and sent Auðr and their son back to her father's house. According to
Landnámabók, Olaf and Þorsteinn Rauðr were both killed in the British Isles. Thorstein the Red was married to Þuriðr Eyvindardóttir Austmann, and they had several children: Gróa, Álof, Þorgerðr, Þórhildr, Vigdís, Ósk, Ólafr feilan, ancestor of Ari Fróði, author of Landnámabók. The family was related to the
Vinland explorers and the Sturlung family. ==Identification and historical conjecture==