WARNING: Potential Spoilers Below!
Name: Ragnvaldur Olafsson
Nickname: Ragnvaldur hinn Heidhumhaeri (Ragnvaldur the Mountain-High)
Cultural Background: Northmenn (from Vestfold in Noregur)
Parents: Olafur Gudhrodharson (Olafur Geirstadha-Alfur - "Elf of Geirstadhir") of Vestfold (father)
Noble House: descended from the Ynglingar
Ragnvaldur is the father of Asa Ragnvaldardottir (Asa Eidhsvardhkona, Asa Oathkeeper). He is elected king of Vestfold after the death of King Halfdanur, but is treacherously slain by his 10-year-old cousin Haraldur, who usurps the throne of Vestfold and becomes King Haraldur Halfdansson the Einkonungur. The death of Ragnvaldur sets in motion the events of The Saga of Asa Oathkeeper.
Appears In: The Saga of Asa Oathkeeper (June 2015)
Source: Based on this historical Ragnvaldr Heiðumhæri