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Paul, Sir James Balfour. "Douglas, Earl Of Angus." The Scots Peerage : Founded On Wood's Ed. Of Sir Robert Douglas's Peerage Of Scotland; Containing An Historical And Genealogical Account Of The Nobility Of That Kingdom. Vol. 1. Edinburgh: David Douglas, 1904. 154. |
Second paragraph, lines 1-2, "William, Earl of Douglas had a natural son George by his sister-in-law Margaret, Countess of Mar and Angus. |