William Douglas, first earl of Douglas (d. 1384) William Douglas (c. 1330 - 1384), first earl of Douglas; second son of Archibald Douglas and Beatrice Lindsay of Crawford. Douglas married Margaret, sister and heir of Thomas, earl of Mar, about 1357, although Froissart, in Book I, § 354, already refers to her as the countess of Douglas in 1356.
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