Douglas Richardson's Royal Ancestry: A Study in Colonial and Medieval Families, ...

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Douglas Richardson's Royal Ancestry: A Study in Colonial and Medieval Families, 5 vols., ed. Kimball G. Everingham (Salt Lake City, Utah: the author, 2013), volume II, page 564: "David ap Gruffudd, Knt., Prince of North Wales... By his mistress, Tangwystl, daughter of Owain Fflam, of Deheubarth, he also had an illegitimate son, Dafydd Goch."

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