Ivar of Waterford was the Norse king of Waterford from at least 969 until his death in the year 1000, and also reigned as King of Dublin, possibly from 989 to 993, and certainly again for less than a
Reginald's Tower in Waterford, believed to have been built by one of Ivar's children or descendants. The topmost part is of later Norman construction.
Ragnall mac Gofraid was King of the Isles and likely a member of the Uí Ímair kindred. He was a son of Gofraid mac Arailt, King of the Isles. Ragnall and Gofraid flourished at a time when the Kingdom
Ragnall's name as it appears on folio 20r of Oxford Bodleian Library Rawlinson B 503 (the Annals of Inisfallen): ("h-ua Arailt"). The name identifies him as a grandson of Aralt.