Margaret Stewart, Countess of Angus
She was the widow of Thomas, Earl of Mar. By an illicit affair with William Douglas, 1st Earl of Douglas, husband of the Earl of Mar's sister, she became the mother of George Douglas, 1st Earl of Angus (c. 1380-1403), and secured a charter of her estates for her son, to whom in 1389 the title was granted by King Robert II.
- Balfour Paul, vol i p 171
- Act of Parliament, Edinburgh 10 April 1389