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Donnchadh benefited from the introduction of feudal primogeniture as a c u s t o m , as it enabled him and his kin to exclude the descendants of Gill e C r e s t , whose contemporary leader was Thomas de Lundin, from the succe ss i o n . P erhaps in gratitude, he named his oldest son William after King W i l l i a m I, the probable source of the innovation in Mar's inheritance cu s t o m .
===Earl of Mar===
Duncan, 4th Earl of Mar [3rd Earl was elder brother Gilchrist], which d i g n i t y he held by 29 Aug 1228, though his right to it was challenged at s o m e p o i nt prior to 1231; witness to the Anglo Scottish agreement sealed a u t u m n 1 237. [ Burke's Peerage ]
===1244 Death===
He died before February 07, 1244 in Mar, Aberdeenshire, Scotland. He w a s b u r i ed in the Cathedral Church of St Machar in Aberdeen
See also:
*http://www.celtic-casimir.com/webtree/13/24060.htm
*http://en.wikipedia.org/wiki/Duncan,_4th_Earl_of_Mar
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Abt 1165 - Bef 1244 (< 79 years)