The Château de Frauenberg dates from 1350 and occupies a site dominating a valley between France and Germany. It was owned by several families, including the lords of Sierck and the counts of Eberstein. Over time, it was altered and renovated, with significant construction in the 13th, 14th, 17th and 18th centuries.
It had been dismantled by Cardinal Richelieu in 1634 and was partly destroyed by fire in 1786. On the eve of the French Revolution, the land was bought by Count Gravier de Vergennes (1719-1787), minister of Louis XVI. The castle housed two pottery kilns which operated in Frauenberg from 1785 to 1791 and were the origin of the notable ceramics company, Villeroy & Boch.
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.