Grafen von Bonn by Cawley, Charles. Medieval Lands: A prosopography of medieval ...

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Grafen von Bonn by Cawley, Charles. Medieval Lands: A prosopography of medieval European noble and royal families. Published by Charles Cawley and the Foundation for Medieval Genealogy (FMG) 2006-2021, including source citations and relevant texts; hosted online by FMG, accessed 2025; see also WikiTree's source page for MedLands)

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