https://en.wikipedia.org/wiki/Crínán_of_Dunkeld

http://en.wikipedia.org/wiki/Crínán_of_Dunkeld

Crínán of Dunkeld was the lay abbot of the diocese of Dunkeld, and perhaps the Mormaer of Atholl. Crínán was progenitor of the House of Dunkeld, the dynasty who would rule Scotland until the later 13th century.
Crinán was married to Bethoc, daughter of King Malcolm II of Scotland . As Malcolm II had no son, the strongest hereditary claim to the Scottish throne descended through Bethóc, and Crinán's eldest son Donnchad I , became King of Scots. Some sources indicate that Malcolm II designated Duncan as his successor under the rules of tanistry because there were other possible claimants to the throne.
Crinán's second son, Maldred of Allerdale, held the title of Lord of Cumbria. It is said that from him, the Earls of Dunbar, for example Patrick Dunbar, 9th Earl of Dunbar, descend in unbroken male line.
Crinán was killed in battle in 1045 at Dunkeld.