Margaret, Countess of Mar

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Margaret of Mar (d. c. 1391) was Countess of Mar in her own right.

She was a daughter of Domhnall II of Mar and after the death of her childless brother Thomas became Countess of Mar. She had married William, first Earl of Douglas, who was succeeded by their son, James, 2nd Earl of Douglas and Earl of Mar and Garioch in right of his mother, and when he fell, leading the Scots at the battle of Otterburn.

She was succeeded by her daughter, Isabel, who became owner of the Earldom of Mar and the Lordship of the Garioch and became the owner the unentailed lands of the House of Douglas.