For more than 200 years, both territories were ruled in personal union by the Stolberg (from 1548: Stolberg-Stolberg) line, until in 1645 the dynasty again divided the dominion and split off the Stolberg-Wernigerode branch.
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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.