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Cawley, Charles. Medieval Lands.: A prosopography of medieval European noble and...
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Cawley, Charles. Medieval Lands.: A prosopography of medieval European noble and royal families, Foundation for Medieval Genealogy (FMG). Chapter 3. DUKES of LOWER LOTHARINGIA, DUKES of LOUVAIN., A. DUKES of LOWER LOTHARINGIA 1106-1222, DUKES of LOUVAIN 1141-1198. MedLands. Accessed 2 May 2025.