Grubenhagen
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The Principality of Grubenhagen was a subdivision of the Duchy of Brunswick-Lüneburg in the Holy Roman Empire. It is also known as Brunswick-Grubenhagen. Grubenhagen was located around the southwestern edge of the Harz, and included the cities of Osterode am Harz, Herzberg am Harz, Duderstadt, and Einbeck.
Grubenhagen was split off from the Brunswick subdivision of the duchy in 1291; its first ruler was Henry, Duke of Brunswick. Henry's sons split the small principality further in 1322; it was reunited in the 15th century. In 1596, Grubenhagen was inherited by the Principality of Calenberg and ceased to exist as an independent principality. However, the territory was disputed by the different lines of Brunswick-Lüneburg for some time. Formally, Grubenhagen remained a state of the Holy Roman Empire until its dissolution in 1806.
