Ivar of Waterford

Ivar of Waterford (Irish: Ímar, rí Puirt Láirgi; Old Norse: Ívarr [ˈiːˌwɑrː]; died 1000) 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 year between 994 and 995, returning after his expulsion from the city in 993 by Sigtrygg Silkbeard, who would expel him for good the next time.

Like his relation and contemporary Ivar of Limerick, and with whom he may actually be confused in one or two instances, Ivar's parentage is a little uncertain. However Clare Downham argues that his claim to Dublin and the names of his sons and grandsons suggest he did belong to the Uí Ímair dynasty. In 1867 James Henthorn Todd suggested him as a son of another Ímar, slain in battle against Ruaidrí ua Canannáin in 950, and assumed to be a son of the powerful Ragnall ua Ímair, King of Northumbria, who occupied Waterford and raided Munster from it in the second decade of the 10th century before moving on to take Scandinavian York. Ivar of Waterford had children and grandchildren also named Ragnall. Mary Valante agrees with Todd.