Ragnall, Raghnall, Ragnvald son of Somerled, Rognvald, Reginaldi filii Sorleti, Reginald or Ranald
King of the Isles,lord of Kintyre,lord of Argyll,Lord of the Isles,dominus de Inchegal,lord of Innse Gall,
The time of Ragnall's birth is not known. He was probably born in Argyll but this is not certain. His father, Somerled Macgillebride, (killed in battle in 1164), is first mentioned in records in 1153, then styled 'regulus' of Argyll, when he rebelled against King Malcolm IV.  As Somerled had already established himself as king by 1153 it is likely that his children were already born prior to that time.
Ragnall was defeated by his brother Angus in 1192. From then on he seems to all but disappear from the records. Some reference to 'circa 1207' is given but he may have lived well beyond that point.
Ragnall was married to "Fonia _____"[Fonie_____]. While it is claimed here that Fonia was of the house of Moray there is no evidence to corroborate this. For more on her possible origins refer to the Wikipedia article on Ragnall mac Somairle - Family and legacy. (2017, February 18).
According to the Foundation for Medieval Genealogy Ragnall & Fonia had three children: Donald (Domnall), Roderick (Ruari) and an unnamed daughter married to Alan Lord of Galloway.These two sons are confirmed by PoMS, The Peerage, and the Chronicles of Mann - The Somerledian Line
Amanda Beam, John Bradley, Dauvit Broun, John Reuben Davies, Matthew Hammond, Michele Pasin (with others), The People of Medieval Scotland, 1093 – 1314 (Glasgow and London, 2012), www.poms.ac.uk. Reginald (Ragnvald), lord of Argyll, PoMS, No. 6562 [accessed 5 March 2017].
Cawley, Charles. "SCOTLAND, MORMAERS, EARLS, LORDS (LORDS of the ISLES) " Foundation for Medieval Genealogy: Medieval Lands, A Prosopography of Medieval European Noble and Royal Families.LORDS of the ISLES [accessed 5 March 2017].
It may be possible to confirm family relationships with Ragnall by comparing test results with other
carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: