The ramifications of early Irish literary history and its claims to antiquity are so multiple, intricate, and inter-connected, that it is difficult for any one who has not made a close study of it to form a conception of the extent it covers and the various districts it embraces. The early literature of Ireland is so bound up with the early history, and the history so bound up and associated with tribal names, memorial sites, patronymics, and topographical nomenclature, that it presents a kind of heterogeneous whole, that which is recognised history running into and resting upon suspected or often even evident myth, while tribal patronymics and national genealogies abut upon both, and the whole is propped and supported by legions of place-names still there to testify, as it were, to the truth of all. We have already glanced at some of the marks left by the mysterious De Danann race upon our nomenclature. Mounds, raths, and tumuli, called after them, dot all Ireland. It is the same with the early Milesians. It is the same with the men of the great pseudo-historic cycle of story-telling, that of Cuchulain and the Red Branch, not to speak of minor cycles. There is never a camping-ground of Mève's army on their march a century B.C. from Rathcroghan in Roscommon to the plain of Mochruime in Louth, and never a skirmish fought by them that has not given its name to some plain or camping-ground or ford. Passing from the heroes of the Red Branch to the history of Finn mac Cool and the Fenians, we find the same thing. Finn's seat, the Hill of the Fenians, Diarmuid and Gráinne's bed, and many other names derived from them or incidents connected with them, are equally widely scattered. The question now arises, does the undoubted existence of these place-names, many of them mentioned in the very oldest manuscripts we have--these manuscripts being only copies of still more ancient ones now lost--mentioned, too, in connection with the celebrated events which are there said to have given them their names, do these and the universally received genealogies of historic tribes which trace themselves back to some ancestor who figured at the time when these place-names were imposed, form credible witnesses to their substantial truth? In other words, are such names as Creeveroe[1] (Red Branch) given to the spot where the Red Branch heroes have been always represented as residing; or Ardee (Ferdia's Ford) where Cuchulain fought his great single fight with that champion--are these to be accepted as collateral evidence of the Red Branch heroes of Ferdia and of Cuchulain? Are See-finn (Finn's seat) or Rath Coole[2] (Cool's rath) to be accepted as proving the existence of Finn and his father Cool?