Question: What is the date of death of Rǫgnvaldr Óláfsson (Fl. 1164)'s father?
Sentence (from "Rǫgnvaldr Óláfsson (fl. 1164)"): He was a son of Óláfr Guðrøðarson, King of the Isles and a member of the Crovan dynasty.
Relevant evidence: Yes