In 1175 the Freiherr von Weissenburg was first mentioned as a land holder and vassal of Duke Berthold IV of Zähringen.

However, Rudolf III sought closer relations with the Habsburgs which made an enemy of the nearby town of Bern.

Ten years later he quarreled with the Habsburgs and the Counts of Neu-Kyburg and lost control over the Rothenfluh and Weissenau Castles.

In the mid-15th century the Lords of Brandis sold all their land holdings in the Bernese Oberland including Weissenburg Castle to Bern.

[2] The castle is located on a steep hill west of Weissenburg village near the confluence of the Bunsch stream and the Simme river.