9th Earl of Mar Uilleam Dhonnchadha

9th Earl of Mar Uilleam Dhonnchadha

Male 1222 - 1281  (59 years)


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  • Name Uilleam Dhonnchadha 
    Title 9th Earl of Mar 
    Birth 1222  Aberdeenshire, Scotland Find all individuals with events at this location 
    Gender Male 
    Death 25 Jul 1281  Aberdeenshire, Scotland Find all individuals with events at this location 
    Person ID I9616  footsteps | Ancestors
    Last Modified 21 Apr 2025 

    Father 4th Earl of Mar Donnchadh Mar,   b. Abt 1165, Aberdeenshire, Scotland Find all individuals with events at this locationd. Bef 7 Feb 1244, Aberdeenshire, Scotland Find all individuals with events at this location (Age < 79 years) 
    Relationship natural 
    Mother Orabillis of Nessius,   b. 1154, Aberdeenshire, Scotland Find all individuals with events at this locationd. 1250, Fifeshire, Scotland Find all individuals with events at this location (Age 96 years) 
    Relationship natural 
    Family ID F5365  Group Sheet  |  Family Chart

    Family Countess Of Mar Elizabeth Isabel Comyn,   b. Abt 1223, Morayshire, Scotland Find all individuals with events at this locationd. 1267, Aberdeenshire, Scotland Find all individuals with events at this location (Age 44 years) 
    Marriage Abt 1242  Aberdeenshire, Scotland Find all individuals with events at this location 
    Children 
    +1. 6th Earl of Mar Domhnall Mar, I,   b. Abt 1230, Aberdeenshire, Scotland Find all individuals with events at this locationd. 25 Jul 1297, Aberdeenshire, Scotland Find all individuals with events at this location (Age 67 years)  [Father: natural]  [Mother: natural]
    Family ID F5178  Group Sheet  |  Family Chart
    Last Modified 21 Apr 2025 

  • Notes 


    • William of Mar, also known by the name Uilleam mac Dhonnchaidh (Anglici z e d a s " W illiam, Duncan's son"), was the mormaer of Mar in medieval Sco t l a n d f rom 1244 to 1276. His father was Donnchadh of Mar.

      Uilleam was responsible for the construction of Kildrummy Castle, the g r e a t e st castle to have been built in 13th-century northern Scotland. It i s o n e o f t h e few examples where a native Scottish magnate built a large -s c a le f o rtification, something normally practiced by the incoming Norm a n s .

      Uilleam, more than any of his predecessors, participated in Scottish an d e v e n B r itish-wide politics, becoming a leading figure in the royal re gi m e o f A l exander II, and the minority of Alexander III. By 1244, Uille a m h a d m a rried into the Comyn house, the fastest rising French family i n t h e S c o ttish kingdom. He married Elisabeth Comyn, the daughter of Wil li a m C o m yn, jure uxoris Earl of Buchan and Marjory, Countess of Buchan. T h e C o m y n-Mar alliance helped fight off the ambitions of the Durwards, w h o w e r e t hen in prime favor with the king.

      Alan Durward used his descent from a daughter of Gille Críst to contest U i l l e a m's right to the Mormaerdom, but Uilleam successfully held off the s e c l a i ms. Uilleam and the Comyn Earl of Menteith then launched accusat i o n s o f t reason towards Alan while at the court of Henry III of England a t Y o r k .
      Chamberlain to Alexander III, Sheriff of Dunbarton