Hochburg castle was founded probably by Dietrich von Hachberg in the 11th century - although the first written mention dates from 1127. Between 1553-1577 the fortifications were completely remodeled and seven bastions were added in the early 1600s. Hochburg was however destroyed by catholic forces in the Thirty Years' War in 1634-1636. The reconstruction and modernization took place in 1660-1678, but it was again destroyed by German volunteers in 1681 to prevent an attack by French forces. The final destruction occured in 1688 by troops of Louis XIV.
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.