The first mention of the Saxon noble Adalbert of Haimar, Count of Wernigerode, in an 1121 deed is also the first documentation of the settlement, which had been founded about a century earlier in connection with the deforestation of the area. The counts built the castle on a slope south of the town as their residence; it was first mentioned as a castrum in 1213. When the line became extinct in 1429, the Wernigerode lands were inherited by the neighbouring County of Stolberg. The castle became the seat of the subordinate Amt administration and was put in pledge several times.
