Tidö is one of Sweden's best preserved Baroque palaces, built in the Dutch Renaissance style. The first building on the site was a medieval house built by the Gren family in the 15th century. In 1537, the Gren family sold the castle to the Queen consort, Margaret Leijonhufvud. In 1540, her husband, king Gustav Vasa, traded the castle to Ekolsund Castle and Tidö came to the Tott family. Today, minor ruins of the former house can be found next to the present building.
The present castle at Tidö was built by the Lord High Chancellor of Sweden Axel Oxenstierna in 1625–1645. The castle was built around a rectangular courtyard with the main building to the north and the three linked wings to the east, west and south. The main entrance is through a vault in the south wing. In 1889, the von Schinkel family bought Tidö and they still own it today. Today visitors may see the Toy Museum.
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.