Duncan 4th Earl of Mar & 5th Earl of Angus 1
- Born: About 1175
- Marriage (1): Unknown
- Died: 7 February 1244 2 3
Other names for Duncan were EHISLACH, Donnchadh 4th Earl of Mar and EHISLACH, Duncan.
There is strong support for the belief that Donnchadh was not the son of his predecessor
"About the year 1224, Gilchrist was succeeded by Duncan (MacGylocher), Morgund's son, becoming the fourth Earl of Mar. A dispute arose between Duncan and Thomas Durward. Durward asserted that Morgund and his son were illegitimate and, on that ground, claimed the Earldom of Mar for himself by right of his mother, wife of Malcolm Lundin, the King's hereditary door-keeper. Thomas's family took the name of Durward from their hereditary office of doorkeepers to the King and for a time thefamily rose rapidly in power and influence."
from Story of Mar 3
The Mormaerdom seems initially to have rotated between two kin-groups, that represented by Morggán, and that represented by Gille Críst. The Mormaerdom was split upon the accession of Donnchadh, a descendant of Morggán. Donnchadh got the title of Mormaer and the wealthier and militarily more useful upland parts of Mar, and Thomas Durward, a descendant of Gille Críst through the female line, got the coastal, low-lying arable land. The line of Mormaers ended when Mormaer Thomas died childless in 1374.