Homburg or Neu-Homburg Castle was the seat of the Froberg family since the 13th century until it was destroyed in 1798. Count Hermann IV of Frohburg settled in 1240 in the Läufelfingen valley. The castle was built by Hermann. The Bishop of Basel acquired Homburg in 1303 and built a new castle with the mighty residential tower as the seat of his Vogts.
After the French Revolution, many of the rural people rebelled against the Basel government. During the night of 23rd to 24th January 1798 Homburg was burnt down. Later the ruin was auctioned for use as a quarry.
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.