Only the Keep Remains - Grubenhagen Castle
Not much remains of Grubenhagen Castle, only the - partly restored to its former 18 metres - keep, an 19th century stable, and traces of the trenches around the outer ward. Nor could I find much reliable information that is supported by more than one source about the place, either.
Grubenhagen Castle, the keep
We don't even know who built the castle - the most likely candidates are Heinrich the Lion of Saxony, or Count Rainald of Dassel. The Dassel family held the lands of what today is called the Solling which bordered to lands held by the Welfen, so the confusion may be understandable. Possessions in such border regions often changed and the castle is mentioned in chartes only at a later time. Rainald von Dassel, Archbishop of Cologne, was the Imperial Chancellor (Reichskanzler) of Friedrich Barbarossa, one of the emperor's most trusted men until his death in the malaria epidemic during the unfortunate Italian campaign in 1167. His brother Ludolf fell in a battle in the same war. Duke Heinrich of Saxony had refused to participate in that campagin; as a result his relationship with the emperor soured which ultimately led to his downfall and exile.
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