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Charles Cawley. Entry for Llywellyn (died 1309), "Medieval Lands": A prosopograp...
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Charles Cawley. Entry for Llywellyn (died 1309), "Medieval Lands": A prosopography of medieval European noble and royal families © by Charles Cawley, hosted by Foundation for Medieval Genealogy (FMG).See also WikiTree's source page for MedLands.