About Mac Ragnaill
An individual identified as Mac Ragnaill (son of Ragnall) by the annals may have been Ragnall's son, though no name is given. In 942 Mac Ragnaill led a raid on Downpatrick, but within a week he was killed by Matudán, Overking of Ulster. The Annals of the Four Masters call Mac Ragnaill a jarl, but the Annals of Ulster call him a king. The Annals of the Four Masters also suggests he and his fellow plunderers came from an island.