Mon Repos villa was built as a summer residence for the British Lord High Commissioner of the United States of the Ionian Islands, Frederick Adam, and his second wife, Diamantina 'Nina' Palatino, in 1828–1831, although they had to vacate the villa soon afterwards in 1832 when Adam was sent to serve in India. The villa was rarely used as a residence for later British governors. In 1833, it housed a school of fine arts, while in 1834, the park was opened to the public. Empress Elisabeth of Austria stayed there in 1863. Here she fell in love with the island, where she later built the Achilleion Palace.
After the union with Greece in 1864, the villa was granted to King George I of the Hellenes as a summer residence; he renamed it 'Mon Repos' (French for 'My Rest'). The royal family used it as a summer residence up until King Constantine II fled the country in 1967. The villa subsequently became derelict, but was restored in the 1990s.
The villa was confiscated under controversial circumstances some years after the declaration of the Hellenic Republic in 1974. Its confiscation, and the confiscation of other property of the deposed and exiled King Constantine II, without any compensation, led to a court case in the European Court of Human Rights.
The King's argument centred on the claim that the property in question was acquired by his predecessors legally and was therefore subject to regular personal inheritance. The Greek state argued that because the property was either used by the royal family by virtue of its sovereign status or obtained by taking advantage of that status, once the monarchy was abolished, the property reverted to public ownership automatically.
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.