According to legend, Valperga Castle was founded during the second half of the 10th century by Dadone, father of King Arduino. The hamlet's fortresses, which date back to the 14th century - a period of major conflict between the Valperga family and the San Martino family, were renovated in the 16th century. But the structure of the fortress changed during the 17th century when the people, brought to their knees from conflict and dying of hunger, took possession of the walls and turned the ditches into fields for farming. It was Cristina di Francia, the unbendable Madama Reale, who put a stop to that and ordered that the walls be cleaned. The original shelter, partially preserved, has the residential rooms which were once used to stockpile food. When, during the second half of the 18th century, the Baron Carlo Giuseppe Coardi di Carpeneto became the owner of the fortress, he had a new wing built next to the original structure. This building, remodeled beginning in 1807, has, overtime, taken on the look of a Neo-Classical villa and is today, a retirement home for the elderly.
A tower with a rectangular layout that forms the entrance and the circular towers in the central body are what remain of the oldest part of the castle.
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.