↑Paul, James Balfour. "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", Edinburgh: David Douglas, 1907, Vol. IV, Archive.org,
pp. 403-5
↑Burke, John Bernard, "Burke's Genealogical and Heraldic History of the Peerage, Baronetage, and Knightage, Privy Council, and order of preference" , London: Harrison & Sons, 1915, 77th ed., Archive.org,
p. 1028
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DNA Connections
It may be possible to confirm family relationships with Roger by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: