Asseburg

The Asseburg is a ruined hill castle on the narrow, southern crest of the Asse ridge in the Harz Mountains of Germany, not far from Wolfenbüttel. The castle was built around 1218 by Gunzelin of Wolfenbüttel and his descendants of the House of Asseburg, as a so-called Ganerbenburg, or castle managed and occupied by more than one family or branch. Based on its dimensions, this elongated fortification was the largest hill castle in North Germany and was considered impregnable. Its purpose was to secure the lands around Wolfenbüttel.

When Gunzelin refused to swear allegiance to Duke Albert I of Brunswick-Lüneburg, of the House of Welf, in 1255, the latter destroyed Gunzelin's Wolfenbüttel Castle and sieged Gunzelin's son Burchardus de Asseburc at Asseburg Castle. Burchard was able to withstand during three years, however in 1258 had to relinquish the castle to Duke Albert I. Burchard was then allowed to retreat to Westphalia with his knights, and received a compensation of 400 gold mark for the castle. After Gunzelin's death in 1260, his sons also lost the county of Peine to the bishop of Hildesheim.

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