Canton of Uri
By 1288, the castle was owned by Werner von Schweinsberg. The Schweinsberg family also owned land and Attinghausen Castle in the Canton of Uri. Werner's son was the famous Uri Landammann Werner von Attinghausen who signed an early treaty and led Uri during the early years of the Growth of the Old Swiss Confederacy. However, the castle at Wartenstein remained with the Schweinsberg family.