Crínán of Dunkeld (died 1045) was the hereditary abbot of the monastery of Dunkeld, and perhaps the Mormaer of Atholl. Crínán was progenitor of the House of Dunkeld, the dynasty which would rule Scotland until the later 13th century. He was the son-in-law of one king, and the father of another.

Ancestral Roots of Certain American Colonists Who Came to America Before 1700, created by Frederick Lewis Weis, 8th edition, page 161, Line 170-19
19. BETHOC (BEATRIX), m. 1000, Crinan the Thane (also called Albanach or Grimus, b. 978, d. 1045, Lay Abbot of Dunkeld, Govenor of te Scots Islands. "1045. A battle between the Scots themselves, where fell Crinan abbot of Duncaillen." (Dunbar, 4, 28; Ritson II: 116; CP IV: 504, IX: 704; SP I: 1).
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Bethóc ingen Maíl Coluim meic Cináeda was the elder daughter of Máel Coluim mac Cináeda, King of Scots, and the mother of his successor, Duncan I.
Bethóc was the eldest daughter of Malcolm II of Scotland, who had no known surviving sons. She married Crínán, Abbot of Dunkeld. Their older son, Donnchad I, ascended to the throne of Scotland around 1034. Malcolm's youngest daughter married Sigurd Hlodvirsson, Earl of Orkney.[1] Early writers have asserted that Máel Coluim also designated Donnchad as his successor under the rules of tanistry because there were other possible claimants to the throne.
In this period, the Scottish throne still passed in Picto-Gaelic matrilineal fashion, from brother to brother, uncle to nephew, and cousin to cousin.
Source: Anderson, Marjorie Ogilvy. Kings and Kingship in Early Scotland, 1973