The Stolberg lands, which were located mostly east of the Harz, included Stolberg, Hayn, the lower County of Hohnstein (1417), as well as Kelbra and Heringen (1413/17), the two latter territories being ruled alongside the House of Schwarzburg.
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On 19 March 1548 the line was split between a Harz line (Stolberg-Stolberg) and a Rhenish line with the possessions in Rochefort (Stolberg-Rochefort) and Königstein im Taunus (Stolberg-Königstein).
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The Counts of Stolberg could significantly enlarge their territory when they inherited the County of Wernigerode in 1429, the County of Königstein in 1535, and the County of Rochefort in 1544.
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As of 1789, the Principality of Blankenburg was surrounded by (from the north clockwise): Brandenburg (County of Stolberg-Wernigerode and Principality of Halberstadt), Anhalt-Bernburg, Brandenburg (County of Hohnstein), and Brunswick-Grubenhagen.
When in 1645 the Stolberg-Stolberg line split, Wernigerode again became the capital of the County of Stolberg-Wernigerode.