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Books about Dunkelgrafen:
Das Geheimnis des Dunkelgrafen: War Prinzessin Marie Therese Charlotte de Bourbon seine Begleiterin?
Wiki information Dunkelgrafen:
The Dunkelgrafen - « Dark Counts » in German -is the nickname given by the locals to a wealthy couple who resided from February 1807 until their death in the vicinity of Hildburghausen, Thuringia, mainly in the castle of Eishausen where they settled...