"Every one who is black-haired, who is a tattler, guileful, tale-telling, noisy, contemptible; every wretched, mean, strolling, unsteady, harsh and inhospitable person; every slave, every mean thief, every churl, every one who loves not to listen to music and entertainment, the disturbers of every council and every assembly, and the promoters of discord among people--these are the descendants of the Firbolgs, of the Galians, of the Liogairne, and of the Fir Domhnann in Eirinn. But the descendants of the Fir Bolg are the most numerous of all these." This is fine old ascendancy talk, the sort of language that has served in many ages to justify the oppression of liberty; and there is plenty of evidence that the older population was in some instances subjected to very harsh treatment--in some instances, not in all, nor were the ancient communities always spoken of in such terms of contempt. Among them, besides industrial groups or castes, there were also others which appear to have followed the profession of arms. Cú Chulainn, according to one tradition preserved by Dubhaltach, belonged to a non-Gaelic tribe called Tuath Tabhairn, and it will be remembered that he is once described as "a small dark man." "Thou little elf!" his charioteer used to call him, to provoke him to do his utmost in the fight. His rival, Fear Diadh, was a noble of the Fir Domhnann from Connacht, and the Fir Domhnann still existed as a subject community in the times to which the tract on the Rent-paying Folks has relation. They are located in a stretch of country comprising the greater part of the counties of Mayo and Sligo. In the eastern Midlands, from the Shannon to the Irish Sea, the same tract places another of these ancient tribes named the Luaighni--a name still preserved in that of the barony of Lune in Meath. These are represented as forming the chief fighting force of the kings of North Leinster in the heroic period. When Conchobhar sets out to exact reparation for the Táin and the invasion of Ulster, he is met by the forces of the Luaighni at Rosnaree on the Boyne, his heroes one after another are worsted in the fight, his army almost routed, and it is only when their king has fallen in single combat that the Luaighni abandon the field. In the curious story of the revolution brought about by the revolt of the Rent-paying tribes against the oppressive rule of the Gaelic nobility, it is the chief of the Luaighni, Cairbre of the Cat's Head, who becomes king of Ireland for twenty years.