The Plantaganet blood-royal of England was introduced later by the marriage of Kenneth Mackenzie, X. of Kintail, to Lady Elizabeth Stewart, daughter of John, second Earl of Atholl, fourth in descent from John of Gaunt, Duke of Lancaster, son of Edward III., and father of Henry IV. of England, and this strain was strengthened and continued by the marriage of Kenneth's son, Colin Cam Mackenzie, XI. of Kintail, to his cousin Barbara, daughter of John Grant of Grant by Lady Marjory Stewart, daughter of John, third Earl of Atholl. It scarcely needs to be pointed out that, through these inter-marriages, the Mackenzies are also descended from the ancient Celtic MacAlpine line of Scottish Kings, from the original Anglo-Saxon Kings of England, and from the oldest Scandinavian, Charlemagne, and Capetian lines, as far back as the beginning of the ninth century. The origin of the O'Beolan Earls of Ross and the Mackenzies from the same source is strikingly illustrated by their inter-marriages into the same families and with each other's kindred. Both the O'Beolans and the Mackenzies made alliances with the Comyns of Badenoch, with the MacDougalls of Lorn, and subsequently with the Macleods of Lewis and Harris, thus forming a network of cousinship which ultimately included all the leading families in the Highlands, every one of which, through these alliances, have the Royal blood of all the English, Scottish, and Scandinavian Kings, and many of the earlier foreign monarchs, coursing in their veins. Surely this is a sufficiently ancient and illustrious origin and much more satisfactory to every patriotic clansman than an Irish adventurer like the reputed Colin Fitzgerald, who, if he ever existed, had not and never could have had any connection with the real origin of the Mackenzies, which was as purely native of the Highlands as it was possible for any Scoto-Celtic family in those days to be. The various genealogical steps and marriage alliances already referred to will be confirmed in each individual case as we proceed with the succession and history of the respective chiefs of the family, beginning with the first of the line, I. KENNETH, OR COINNEACH, Who gave his name to the clan. His is the fourth ascending name in the manuscript genealogy of 1467, which begins with Murdoch of the Cave. Murdoch died in 1375, and was thus almost contemporaneous with the author of the Gaelic genealogy, which, translated, proceeds up to this Kenneth as follows: Murdoch, son of Kenneth, son of John, son of Kenneth, and so on, as already given at page 39 to Gilleoin of the Aird.