Ten years after this he took advantage of the slaughter of the bishop of Caithness by the Norwegian earl of Orkney and Caithness, to extend his power over that district likewise, and to reduce its earl to submission. Harald, the earl at this time, was not a very distant relation of the king by paternal descent, being the son of Madach, earl of Atholl, whose father was a brother of Malcolm the Third, but he inherited the earldom of Orkney to which Caithness at this time was attached, through his mother, Margaret, the daughter of a previous earl, of Norwegian descent, and he had married a daughter of Malcolm MacHeth, the so-called earl of Moray, and was thus associated with that family in their opposition to the Crown. The result of two separate invasions of Caithness by the royal army was, that Caithness, north of the great range called the Ord of Caithness, was eventually restored to Earl Harald, to be held by him on payment to the Crown of a large sum of money; while the district south of that range, which has the Norwegian name of Sudrland or Sutherland, was retained by the king, and bestowed upon Hugo, a scion of the house of De Moravia, as a lordship, and eventually made an earldom in the person of his son William. Before the death of William one of the old Celtic earldoms had passed by succession into the hands of a foreign baron, for William Cumyn, the head of the Norman house of that name, became possessed of the earldom of Buchan by his marriage with Marjory, daughter of Fergus, the last of the Celtic earls. [Sidenote: Seven Earls in the reign of Alexander the Second.] Alexander the Second, the successor of William, followed out the same policy, but during his reign, notwithstanding the increase in the number of the earldoms, and the feudalisation of some of the older ones, we find the seven earls of Scotland frequently making their appearance, apparently as a constitutional body whose privileges were recognised. They first appear as taking an important part in the coronation of Alexander as king of Scotland, and then consisted of the earls of Fife, Stratherne, Atholl, Angus, Menteath, Buchan, and Lothian.[84] With the exception of Menteath, which was a more recent earldom, these are the same earldoms whose earls gave their consent to the foundation charter of Scone; but Menteath comes now in place of Mar, perhaps owing to the controversy as to the rightful possessor of the latter earldom, and Buchan was, as we have seen, now held by a Norman baron.