Schloss Greifenstein is a castle in the mountainous Fraconian Switzerland region of Upper Franconia, Germany. Since 1691 Greifenstein, the 'stone stronghold' of Heiligenstadt round its walls, is the seat of the noble Schenk von Stauffenberg family. Greifenstein is a prominent feature of the modern tourist itinerary called the Burgenstraße.
The Gothic castle that was first noted in 1172 was ruined and pillaged during the Peasants' war of 1524-1525 and was subsequently rebuilt. Then Marquard Sebastian von Schenk von Stauffenberg, Prince-Bishopric of Bamberg, took possession and rebuilt Greifenstein in Baroque style from 1691 to 1693, under the direction of the Bavarian architect Leonhard Dientzenhofer; consequently, as a seat of the bishop it is sometimes called Greifenstein Palais, though the aofficial bishop's palace stood (and still stands) in Bamberg.
A comprehensive restoration was carried out by Otto Philipp Schenk, Graf von Stauffenberg, in 1975–77.
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.