Duncan of Mar, 4th Earl of Mar

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Dhonnchaidh mac Morggán, 4th Earl of Mar

Birthplace: Mar, Aberdeenshire, Scotland
Death: before February 7, 1244
Mar, Aberdeenshire, Scotland
Place of Burial: Aberdeen, Aberdeenshire, Scotland, United Kingdom
Immediate Family:

Son of Morggán mac Gylocher, 2nd Earl of Mar and Agnes d'Harcourt
Husband of Agnes, Countess of de Mar and Orabella Latherisk
Father of Margaret of Mar and William de Mar, 5th Earl of Mar
Brother of Gilchrist de Mar; Malcolm Mar; James Mar; John Mar; Sir Donald Mars and 1 other
Half brother of Robert d'Harcourt

Occupation: 4th Earl of Mar
Managed by: Private User
Last Updated:

About Duncan of Mar, 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.


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]

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Duncan of Mar, 4th Earl of Mar's Timeline

Mar, Aberdeenshire, Scotland
Age 62
Mar, Aberdeenshire, Scotland
Age 64
Aberdeenshire, Scotland
February 7, 1244
Age 86
Mar, Aberdeenshire, Scotland
February 7, 1244
Age 86
Aberdeen, Aberdeenshire, Scotland, United Kingdom
June 13, 1933
Age 86
November 3, 1992
Age 86
November 5, 1992
Age 86
November 20, 1992
Age 86