Château de Blanquefort is a ruined castle standing on a spur overlooking the Briolance valley. In the ninth century, a first fortification was built. The white stone gave the fort the name 'White Fort', in Latin Blanca Fortis, which evolved into the modern name Blanquefort. During the Plantagenet holding of Aquitaine, the fortifications were expanded into a royal fortress at the end of the thirteenth century by Edward I of England. At the end of the Hundred Years War, the fortress became French. A wine-producing village grew around the fortifications, probably worked predominantly by serfs.
Most of the buildings date from the Middle Ages, including a keep and gatehouse (13th century), a gun tower (15th century) and two lowered towers (12th and 13th centuries), incorporated into the house.
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.