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Birth:          ABT 1210 Mar, Aberdeenshire, Scotland
Death:          1276 

Notes
ancestry.com
https://en.wikipedia.org/wiki/Uilleam,_Earl_of_Mar
Uilleam of Mar, or Uilleam mac Dhonnchaidh (Anglicized: William, Duncan's son), was 
perhaps the greatest of the mormaers of Mar ruling from 1244 to 1276, also known as 
Earl of Mar.

Uilleam was responsible for the construction of Kildrummy Castle, the greatest castle 
to have been built in 13th century northern Scotland. It is one of the few examples 
where a native Scottish magnate built a large-scale fortification, something normally 
practiced by the incoming French.

Uilleam, more than any of his predecessors, participated in Scottish and even British-
wide politics, becoming a leading figure in the royal regime of Alexander II, and the 
minority of Alexander III. By 1244, Uilleam had married into the Comyn house, the 
fastest rising French family in the Scottish kingdom. He married Elisabeth Comyn, the 
daughter of William Comyn, jure uxoris Earl of Buchan. The Comyn-Mar alliance helped 
fight off the ambitions of the Durwards, who were then in prime favor with the king.

Alan Durward used his descent from a daughter of Gille Críst to contest Uilleam's right 
to the Mormaerdom, but Uilleam successfully held off these claims. Uilleam and the 
Comyn Earl of Menteith then launched accusations of treason towards Alan while at 
the court of Henry III of England at York.

Uilleam engaged in supplementing his power on a nationwide basis. He held the post 
of Sheriff of Dumbarton between 1264 and 1266, a post which opened up connections 
in the western Highlands. Uilleam was able to marry his younger son Donnchadh to 
Cairistíona Nic Ruaidhrí, daughter of the Hebridean chief Ailéan mac Ruaidhrí, a man 
who had been one of the principal supporters of Norwegian cause against the Scottish 
Crown in the 1260s.

When his wife Isabel (also called Elizabeth, daughter of Sir William Comyn and Marjory 
Colham) died in 1267, Uilleam married Muriel, the daughter of Maol Íosa II, Mormaer of 
Strathearn.

Uilleam died in 1276, and was succeeded by his son Domhnall.

Parents
MAR Duncan (Donnchadh) (ABT 1160 - 1244)
OF NESSIUS Orabillis (ABT 1180 - )

Siblings
MAR Uilleam (William) (ABT 1210 - 1276)

Marriage To COMYN Elizabeth (ABT 1223 - 1267)
    m.  

Notes

Parents
COMYN William (1163 - 1233)
OF BUCHAN Margaret (ABT 1184 - ABT 1243)

Children by COMYN Elizabeth ABT 1223 - 1267
MAR Domhnaill (Donald) (ABT 1243 - ABT 1300)

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