Egerberk is a ruined castle near Klášterec nad Ohří. First mentioned in 1317, the castle belonged to Wilhelm who first started to bear the attribute name 'of Egerberg'. Wilhelm was a friend of John of Luxembourg and accompanied him on his journeys. His brother Fritz was given several villages and started to bear the name of one of them - Pětipsy. The castle was then sold to the House of Šumburk from a nearby castle. In 1384 Egerberk was added to the property of the House of Škopek and Jindřich Škopek z Dubé started a large-scale reconstruction. At the end of the 16th century the castle was already abandoned.
References:Sigmaringen Castle was first mentioned in the year 1077 in the chronicles of Petershausen monastery. The oldest parts of the castle are concealed beneath the alterations made during the 17th and the 19th centuries. The secret of the earliest settlement built on this defendable rock will never be fully revealed: large-scale excavation work would be necessary, which the extensive land development renders impossible. Judging from the many Roman remains unearthed in the area around Sigmaringen, the 12th century keep known as the 'Roman Tower' could be traced back to a Roman predecessor.
The castle remains that have been preserved (gate, great hall and keep) date back to the Staufer period around 1200. The castle remains were integrated into subsequent buildings. The foundations of the castle buildings are to a large extent identical to the surrounding castle wall.
These remains give us a good idea of how the castle might have looked during the 12th century.