Harald Maddadsson

Harald Maddadsson (Old Norse: Haraldr Maddaðarson, Gaelic: Aralt mac Mataid) (c. 1134 – 1206) was Earl of Orkney and Mormaer of Caithness from 1139 until 1206. He was the son of Matad, Mormaer of Atholl, and Margaret, daughter of Earl Haakon Paulsson of Orkney. Of mixed Norse and Gaelic blood, and a descendant of Scots kings, he was a significant figure in northern Scotland, and played a prominent part in Scottish politics of the twelfth century. The Orkneyinga Saga names him one of the three more powerful Earls of Orkney with Sigurd Eysteinsson and Thorfinn Sigurdsson.

In the early twelfth century, the Earldom of Orkney, although weakened since the time of Earl Thorfinn, remained in control of Caithness and was dominant in Sutherland and parts of the Outer Hebrides. Thus the succession of the earldom was of great interest to the Scots king David I. The marriage of Matad and Margaret is believed to have taken place not long before 1134, shortly following David's suppression of a major revolt involving Mormaer Óengus of Moray, grandson of king Lulach, and Máel Coluim mac Alaxandair, the illegitimate son of David's brother Alexander, and the subsequent extension of royal power into the provinces of Moray and Ross. David's nephew William fitz Duncan was appointed to rule Moray, and it has been proposed that Matad, whose power lay in the Scottish kingdom's heartland of Atholl, may also have been granted authority in the new lands north of the Mounth, and that his marriage to Margarat Haakonsdaughter was arranged with this in mind.

...
Wikipedia