Ragnall ua Ímair (died 1035), also known as Ragnall mac Ragnaill,[note 1] was an eleventh-century King of Waterford. He appears to have ruled as king from 1022 to 1035, the year of his death.
Ragnall's name as it appears on folio 16v of Oxford Bodleian Library MS Rawlinson B 488 (the Annals of Tigernach): "Ragnall mac Raghnaill meic Ímuir".
Ragnall seems to have been a descendant of Ímar, King of Waterford (died 1000). Ragnall's father may have been Ragnall mac Ímair, King of Waterford (died 1018). Such a relationship would indicate that the patronymua Ímair—accorded to Ragnall by the Irish Annals that note his death—refers to Ragnall mac Ímair's father, the aforesaid Ímar.[note 2]
The following year, Sitriuc mac Amlaíb was driven out of Dublin by Echmarcach mac Ragnaill (died 1064/1065). Whilst the parentage of the latter is uncertain, if he was a related to Ragnall—perhaps as either a brother or son—it could mean that Echmarcach's actions against Sitriuc mac Amlaíb were undertaken in revenge for his death. Against this possibility is the fact that there is no evidence that Echmarcach, or his known family, had any connection with Waterford. Whatever the case, Ragnall's fall appears to have been an important benchmark in Waterford's history, and after this date the enclave increasingly fell prey to the machinations of the Uí Briain and the Uí Cheinnselaig. In fact, two years after the killing, the King of Waterford was Cú Inmain ua Robann (died 1037), an apparent Irishman.
^Also known as Ragnall Ua Ímair, and Røgnvaldr Røgnvaldarson.
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