Welsberg Castle (Castel Monguelfo in Italian) lies in a strategic position above Casies Valley. The castle was built in 1140 by the two brother Schwinkher and Otto von Welsberg. This latest wanted the overhanging upon his lands. For more than 800 years the castle had been property of the von Welsbergs, one of the mightiest families in Tyrol, who obtained the title of Prince of the Holy Roman Empire in 1693 by the emperor Leopold I.
The construction can be divided into two main periods: the first Romanesque one in the XII century, and the second one, in the gothic and Renaissance period in the XVI century. The oldest element of the castle is the tall defensive tower built between 1126 and 1140. Around it the old Romanesque chapel, the residential building, and the other buildings had been built.
In 1765 the castle was destroyed by a fire and the upper floor had to be broken up and the roof brought down to the present height. Since then the castle had been forgotten till recent times when the heir of the Welspergs entrusted it to the Kuratorium Committee which completely restored it and made visits available during summer season.
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.