Grönsö (or Grönsöö) Castle was built in 1607-1610 by the Privy Council Johan Skytte. The building was constructed of brick and granite in a French style with pitched roof, ridge turrets and four rectangular corner towers. The ground floor can still be seen today with well-preserved interiors and painted ceilings from the 1600s.
Family Skytte owned Grönsö throughout the 1600s until it was reduced to the crown. After reduction, Grönsö has seen number of ownership changes. During the first half of 1700s of the castle was owned by the family Falkenberg . The castle underwent major repairs, whereby the house lost its tower in 1738. The building got its simple but stylish look that survived into modern times.
In 1700 the second half of the estate was owned by Stockholm doctor David von Schultzheim , who in 1786 built a Chinese pavilion on the waterfront, which today is one of Grönsö’s major attractions. The pavilion is located on the waterfront and built according to models of the architect William Chambers and the interior is decorated with shells and minerals from East Asia.
In 1820 Grönsö was acquired by Court Chamberlain, Reinhold Fredrik von Ehrenheim, the first in the current owner's family. The castle has never been completely reconstructed, but has gradually evolved. Traces of each period, thereby continuously preserved in the palace in an unusual way today. The castle is owned and operated today by the family von Ehrenheim and Grönsöö cultural foundation. Grönsö covers 720 hectares of land, which includes apple orchards. Castle Park renovated carefully with the help of landscape architects from the Swedish University of Agricultural Sciences.
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.