SOURCE-08173Research NeededProbable
John Beaufort, Earl of Somerset by Cawley, Charles and the Foundation for Mediev...
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John Beaufort, Earl of Somerset by Cawley, Charles and the Foundation for Medieval Genealogy (FMG) in Medieval Lands: A prosopography of medieval European noble and royal families. Published online byFMG, including source citations and relevant texts: England, Kings 1066-2022 v5.0 Updated 14 Mar 2026 (see also WikiTree's source page for MedLands).