Question: What is the date of death of Rǫgnvaldr Óláfsson (Fl. 1164)'s father?
Sentence (from "Óláfr Guðrøðarson (died 1153)"): Warring soon broke out between factions supporting Lǫgmaðr's younger brother Haraldr, which led to the intervention and encroachment of Irish power into the region.
Relevant evidence: No