Cawley, Charles. 'Saxony, Nobility: Chap. 6C. Grafen von Northeim' version 3.6, ...

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Cawley, Charles. 'Saxony, Nobility: Chap. 6C. Grafen von Northeim' version 3.6, 07 February 2018. In Medieval Lands: A prosopography of medieval European noble and royal families. Foundation of Medieval Genealogy, http://fmg.ac/Projects/MedLands/index.htm

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