The old name is not known. Probably founded in early Salian times. The assumption that the castle was destroyed by Emperor Frederick I Barbarossa in 1168 is just as hypothetical as previous destruction or damage, as there are no written records. (Dieter Barz)
With regard to the structural development of the Schlössel, a distinction is made between four periods:
Period I: 9th or 10th century: Late Carolingian rampart made of rough masonry (10th century). Possibly built during the Hungarian invasions between 917 and 925. In analogy to other complexes, there was probably a kind of assembly hall in the raised part of the site. The large rampart enclosed further accommodation for warriors and court servants as well as storage and farm buildings. Only excavations can provide clarity about the interior construction.
Period II: 11th century: The Carolingian curtis is extended and surrounded by a pointed moat. Ashlars with ornamental strokes and spolia suggest that the earliest castle construction dates back to the Salian period.
Period III: 1st quarter of the 12th century: The Salian castle was probably rebuilt around 1125 by Duke Frederick the One-Eyed after its destruction in 1114. Only the lowest floor of the residential tower has survived. The outer bailey was reduced in size and separated from the older complex by a new moat.
Period IV: 2nd half of the 12th century: According to one assumption in the literature, the complex was destroyed by Emperor Barbarossa in 1168. Apparently the ruins were not rebuilt after their destruction. (Jens Friedhoff)
The castle is situated on a rocky outcrop. Approximately in the centre are the remains of a residential tower with an abort shaft and porch within a curtain wall with a gate tower. The castle had a small outer bailey to the west and was additionally secured on the other sides by a moat with a rampart in front. (Dieter Barz)