The remaining genealogies in these MSS. have one common feature, that the genealogy of each of the clans contains in it the name of Cormac, son of Airbertach, but he is differently connected with the line of Lorn, and is placed in many of the genealogies at a different period. They may be thus grouped. The first consists of the _Clan Andres_ or Rosses, the _Clan Cainig_ or Mackenzies, and the _Clan Matgamma_ or Mathesons. These are all brought from a common ancestor, _Gilleoin na hairde_ or Gilleon of the Aird, by which, no doubt, the mountainous region in the centre of Ross-shire, the old name of which was Airdross, or the Aird of Ross, is meant. The Rosses and Mathesons are brought from his son Cristin, and the Mackenzies from another son, Gilleon Og, father of _Cainig_ or Kenneth, the eponymus of the clan. _Gilleon na hAirde_ is made grandson of Loarn, son of Fearchar, son of Cormac mac Airbertach, and the usual calculation would place Cormac in the tenth century; but his father Airbertach is made son of Feradach, and brother of Fearchar Fada, who died in 697. To this group may be added the _Clan Duibsithe_ or Macduffys of Lochaber and Colonsay, who are brought from Fearchar, son of Cormac; but the connecting links are shorter and bring him down to two centuries later. The Macnabs are likewise brought from Loarn, son of Fearchar, son of Cormac, which would relegate him also to the tenth century; but in this genealogy, instead of placing Cormac in immediate connection with Fearadach, he is made son of Erc, son of Domnaill Duinn, son of Fearchar Abraruadh, thus corresponding more with the early part of the genealogy of the Clan Labhran and Clan Aidh. The Clan Gregor is likewise brought from Cormac by a son Ainnrias or Andrew, and by this genealogy he is placed in the twelfth century, and is made son of Fearchar Oig, son of Fearchar Fada, who died in 697. The last group consists of the _Clan Guaire_ or Macquarrys, the _Clan Fingaine_ or Mackinnons, the _Clan Gillamhaol_ or Macmillans, and the _Clan Gillaagamnan_ or Maclennans, descended respectively from four sons of Cormac—Guaire, Fingaine, Gillcrist called _Gillamhaol_, and Gillaagamnan. By these genealogies Cormac is brought down a century later, and this is probably his true date, and as an ancestor of these clans he is also probably an historical personage, for in the genealogy of the _Clan Gillamhaol_ it is added that his father Airbertach possessed twelve tribes or septs (_Treabh_) among the Norwegians—viz., in _Greagraidhe_ of the warriors, commonly called Mull, and in Tiree, and in _Craobhinis_, by which Iona is meant, while it is in Mull and the neighbouring islands that the Maclennans and Macquarrys had their possessions; but in these genealogies Airbertach is made son of Murcertach, son of Fearchar Og, and between the latter and Fearchar Fada, the names of Macbeth and his father Finnlaoch, which really belong to the genealogy of the Mormaers of Moray, are introduced.