STEWART, Margaret co-heiress, Countess of Angus and Mar ^{1 2}

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  General Notes:

"Margaret Stewart and her sister Elizabeth enjoyed the Angus estates in common until February 1379, when Elizabeth surrendered to her elder sister all her rights as co-heir of their father, an arrangement confirmed by King Robert II. A month before, in a charter by her to her half-brother, John Sinclair of Herdmanston, Margaret describes herself as Countess of Mar and daughter of the late Thomas Stewart, Earl of Angus, but after the arrangement with her sister she took the title of Countess of Angus and Mar."

from Scots Peerage (vol 1) ²

Margaret married Thomas Earl of Mar, son of Donald Earl of Mar, Regent of Scotland and Isabel STEWART.¹ (Thomas Earl of Mar was born about 1330 and died by 21 June 1374 ^{1 3}.)

  Marriage Notes:

"The Earl (of Mar) married, first .... Margaret, daughter of Sir John Graham, Earl of Menteith, and Mary, Countess of Menteith, but because he had no issue by her .... divorced her, and married, secondly, Margaret Stewart, the elder daughter and co-heiress of Thomas Stewart, Earl of Angus, by whom also he had no issue."

from Scots Peerage (vol 5) ¹

Margaret had a relationship with William DOUGLAS Earl of Douglas, 'Earl of Mar', jure uxoris, son of Sir Archibald DOUGLAS Regent of Scotland and Beatrice LINDSAY.² (William DOUGLAS Earl of Douglas, 'Earl of Mar', jure uxoris was born about 1320, died in May 1384 in Douglas, Lanarkshire, Scotland ⁴ and was buried in 1384 in Melrose Abbey, Roxburghshire, Scotland ⁴.)

  Marriage Notes:

"Her (Margaret's) title of Countess of Mar has led to confusion, and Godscroft, followed by Wood, has given this lady an entirely wrong position, while an imaginary Thomas, third Earl of Angus, has been assigned as her husband. They also state that she became the third wife of William, first Earl of Douglas, after the death of his Countess, Margaret of Mar, who was Margaret Stewart's sister-in-law. But this is erroneous, as the Earl's only wife survived him"

from Scots Peerage (vol 1) ²