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Cawley, Charles. "Thuringia, Nobility: Chapter 13, Grafen von Weimar." Medieval ...
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Cawley, Charles. "Thuringia, Nobility: Chapter 13, Grafen von Weimar." Medieval Lands: A prosopography of medieval European noble and royal families. July 31, 2015. Foundatio of Medieval Genealogy website fmg.ac/Projects/Medlands : accessed September 18, 2016.