“Amhlaoibh Conung, son of the King of Lochlann,” known in Icelandic sources as Olaf the White, came to Ireland about 852 to rule over his countrymen, and to exact tribute from the Irish.[10] According to the _Fragments of Annals_, he left suddenly and returned a few years later accompanied by his “younger brother, Imhar,” who may be identified with Ivarr Beinlausi (_i.e._, “the Boneless”) son of Ragnarr Lothbrók. Both kings ruled from Dublin, which town now gained a new importance as the seat of the Scandinavian Kings in Ireland. In 865 the Vikings extended their activities to Scotland, whence they carried off much plunder and many captives. An expedition on a larger scale was made by Olaf and Ivarr in 869, when Dumbarton, after a four months’ siege, fell into their hands. They returned in triumph to Ireland in the following year with a large number of English, British, and Pictish prisoners and ended their victorious march by the capture of Dunseverick (Co. Antrim).[11] Olaf returned to Norway some time after this to take part in the wars there,[12] and we hear no more of him in the Irish Annals. “Imhar, King of the Norsemen of all Ireland and Britain,” did not long survive him; his death is recorded under the year 873.[13] During the years which followed Ivarr’s death the country was comparatively peaceful, and the Irish began to enjoy a rest from fresh invasions, which lasted about forty years.[14] The Danes and the Norsemen again began to quarrel among themselves, and once more their opposing fleets met on Carlingford Lough;[15] in this battle Albann (O.N. Halfdanr), brother of Ivarr, a well-known leader of the Vikings in England, was slain. Dissensions also spread among the ranks of the Dublin Norsemen, dividing them into two hostile parties, one siding with Sitriucc, son of Ivarr, the other with a certain Sighfrith.[16] This internal strife so weakened Norse power that the Irish captured the fortress at Dublin in 902, and drove the Vikings across the sea with great slaughter. The forty years’ rest terminated abruptly in 913, when several fleets arrived at Waterford and proceeded to ravage all Munster and Leinster. In 916 Raghnall (O.N. Rögnvaldr), grandson of Ivarr, assumed command while his brother or cousin, Sihtric Gale (also nicknamed Caoch, ‘the Blind’) came with a fleet to Cenn Fuaid, in the east of Leinster, and built a fortification there.[17] Both chiefs united forces against the _árd-rí_ Niall Glundubh, and having defeated him in battle Sihtric entered Dublin and became king (918). In the following year the Irish under Niall made a brave stand at Kilmashogue, near Dublin, but Sihtric won a decisive victory, and Niall and twelve other kings were among the slain.[18]