Hen Lwythau Gwynedd a'r Mars, a medieval manuscript containing pedigrees of the ...

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Hen Lwythau Gwynedd a'r Mars, a medieval manuscript containing pedigrees of the chief non-royal families of north Wales, edited by P.C. Bartrum in the National Library of Wales Journal, vol xii, part3. Cited by Wikipedia: Cynfyn_ap_Gwersytan Accessed August 29, 2018. jhd

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