Duncan of Mar, 4th Earl of Mar

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• http://www.celtic-casimir.com/webtree/13/24060.htm

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http://en.wikipedia.org/wiki/Duncan,_4th_Earl_of_Mar

Donnchadh of Mar, (Anglicized as Duncan), is the fifth known Mormaer of Mar, 1203-1244.

Donnchadh was the son of Morggán and Agnes. Donnchadh benefited from the introduction of feudal primogeniture as a custom, as it enabled him and his kin to exclude the descendants of Gille Críst, whose contemporary leader was Thomas de Lundin, from the succession. Perhaps in gratitude, he named his oldest son William after King Willian I, the probable source of the innovation in Mar's inheritance custom. He married Orabillis of Nessius, by whom he fathered William, and died in 1244.

http://en.wikipedia.org/wiki/Donnchadh%2C_Earl_of_Mar

Duncan, 4th Earl of Mar [3rd Earl was elder brother Gilchrist], which dignity he held by 29 Aug 1228, though his right to it was challenged at some point prior to 1231; witness to the Anglo Scottish agreement sealed autumn 1237. [Burke's Peerage]