This hostility would seem to have been due to rivalry between two powerful kingdoms, rather than, as has been suggested,[101] to difference of nationality. It is not at all certain that the Limerick Vikings were purely Danes. One Irish chronicler speaks of the Scandinavians in Munster as _Gaill_ and _Danair_ and calls their fleets _loingeas Danmarcach ocus allmurach_ (“fleets of Danes and foreigners”).[102] Elsewhere[103] we find the word Lochlannaigh (_i.e._, Norsemen) used with reference to the Limerick settlers; and Colla (O.N. Kolli), Prince of Limerick (d. 931) was certainly a Norseman, for he was son of Barthr, a leader of the Finn-Gennti in the ninth century. There would seem to have been a mixture of both Danes and Norsemen in Limerick, and since there is no proof that struggles for mastery took place between them, we may take it that they acted in harmony. During the tenth century Limerick stood in close connection with the Scandinavian Kingdom in the Hebrides.[104] Mention is made of one chieftain “Morann, son of the Sea King of Lewis,”[105] who fought and fell in Limerick against the Irish. Moreover, the occurrence of the names Manus, Maccus (O.N. Magnus) and Somarlidh (O.N. Sumarlithi) in both royal families points at least to relationship by marriage. Indeed, the same family seems to have reigned in both kingdoms. “Godfrey, son of Harold, King of the Hebrides,” who was slain by the Dal Riada in 989[106] was in all probability a son of that “Harold, lord of the foreigners of Limerick,” whose death is recorded by the Four Masters in 940. Practically nothing is known of the Scandinavian settlement in Waterford[107] (O.N. _Vethrafjörthr_) before the year 919, when Vikings under Raghnall (O.N. Rögnvaldr), “King of the Danes,” concentrated their forces there before attacking Dublin. These invaders, sometimes called Nortmannai (‘Norsemen’), but generally alluded to as _Gaill_ (‘foreigners’) must have also included Danes, as Raghnall’s army was composed of both Danes and Norsemen;[108] and moreover, both parties are represented as fighting side by side against the Irish in Waterford.[109] Waterford had not at first a dynasty of its own, but was dependent on the Dublin Kingdom. Olaf Godfreyson seems to have been in command there while his father was King of Dublin;[110] and we hear also that when the town was attacked by the Irish under Cellachan of Cashel, Sihtric, a prince from Dublin, came with a fleet to relieve it.[111] Later in the same century, the kingdom of Waterford stood quite distinct, and was governed by Ivarr (d. 1000), who was probably a member of the Dublin royal family. He came forward as a claimant to the Dublin throne after the murder of Gluniarainn, son of Olaf Cuaran (989) but was driven out after a three years’ reign by Sihtric Silken-Beard. Ivarr’s successors in Waterford, Amond (O.N. _Amundr_) and Goistilin Gall were killed in the battle of Clontarf.