In these MSS. we find detailed pedigrees of most of the clans enumerated in the Acts of Parliament of 1587 and 1594, and of several clans not there mentioned, as well as of some of the surnames. The later portion of these pedigrees, as far back as the _eponymus_ or common ancestor from which the clan takes its name, are in general tolerably well vouched, and may be held to be authentic. The older part of the pedigree will be found to be partly historical and partly mythic. So far as these links in the genealogic chain connect the clans with each other within what may be termed the historic period, the pedigree may be genuine; but the links which connect them with the mythic genealogies of the elaborate system of early Irish history, when analysed, prove to be entirely artificial and untrustworthy. In examining the nature of these pedigrees it will be convenient to group them according to their supposed connection with the legendary races of early Irish history.[468] The first group consists of the Clan _Cailin_ or Campbells, and the Clan _Leod_ or MacLeods, who are brought from a mythic personage, viz., _Fergus Leith Derg_, son of _Nemedh_, who led a colony of Nemedians from Ireland to Scotland. This Nemedian colony belongs to the older legendary history of Scotland before the Chronicles were corrupted, and may therefore indicate these clans as forming part of the older inhabitants of the districts they occupy. On examining the genealogy of the Campbells we may consider it as authentic as far back as Duncan, son of Gilleaspic, son of Gillacolum, son of Duibne, who is certainly the Duncan M‘Duibhn mentioned in one of the Argyll charters as possessing Lochow and Ardskeodnich, and who was contemporary with Alexander the Second. As the Campbells were undoubtedly known in Gaelic as the _Clan O’Duibne_,[469] the genealogy as far back as that eponymus of the race is probably authentic; but as soon as we pass that link we find ourselves in contact with Arthur and Uthyr Pendragon, and the other heroes of the Arthurian legend. With the Macleods we cannot proceed so far back, as Leod, the eponymus of the clan, cannot be placed earlier than the middle of the thirteenth century; and as soon as we pass these links in the chain of his pedigree, which have Gaelic names, we plunge into a confused list of names, partly Gaelic and partly of Norwegian and Danish kings of the Isles, with which they are mixed up, till we reach the mythic _Fergus Leith Derg_, whose grandson bears the Norwegian name of Arailt or Harald, centuries before the Norwegians made their appearance in the Isles. The earlier portion then of these two genealogies is obviously artificial.