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Simpson (1713); Burke, Messrs., John and John Bernard, The Royal Families of Eng...
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Simpson (1713); Burke, Messrs., John and John Bernard, The Royal Families of England, Scotland, and Wales, &c., volume 2, London, 1851, p.xl; Mackenzie, A. M., MA., D.Litt., The Rise of the Stewarts,London, 1935, pps.8 -9. Cited by Wikipedia. Walter FitzFlan