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Charles Cawley. Entry for Rhys (died 1197), "Medieval Lands": A prosopography of...
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Charles Cawley. Entry for Rhys (died 1197), "Medieval Lands": A prosopography of medieval European noble and royal families © by Charles Cawley, hosted by Foundation for Medieval Genealogy (FMG). Seealso WikiTree's source page for MedLands.