The name of the rulers of the Trachselwald Castle was first mentioned in 1131. The castle itself may date back to the 10th century but the 11th or 12th century is more likely. At first it belonged to the barons of Trachselwald, then to the barons of Rüti bei Lyssach, and then those of Sumiswald. The barons of Sumiswald sold the castle and surrounding lands to the city of Bern. Bern turned the castle into a sheriffhood.
The castle was rebuilt or expanded several times. Its oldest parts are the keep, which was built out of tuff, and one half of the main building. These parts of the castle were built in the second half of the 12th century. The stair tower was probably built by a master craftsman from Prismell in 1641.
During the Swiss peasant war of 1653, the peasant leader Niklaus Leuenberger, who was arrested on June 19, 1653 was held in Castle Trachselwald until being taken to Bern, where he was executed on August 27.
The castle was sacked during the 1798 French invasion, but was not burned. It became the center of administration of the district of Trachselwald.
The first castle consisted of a square keep that was about 10 m on each side. The keep and outer walls are made of tuff stone cut into roughly squared blocks which indicates construction before 1200. The dendrochronology dating of the beams indicates that they came from 1251 to 1253. Along with the keep, part of the main building was added during the first construction period. The original keep was probably surrounded by an elliptical ring wall.
In the 14th century the original two story keep doubled in height. In the 16th or 17th century a palas, dungeon and other buildings were added to the castle. The new additions were built in a Romanesque style, which included larger windows and thinner walls. A stair tower was added in 1641 and a granary was built in 1683. The palas was renovated during the 17th and 18th century into its current appearance. In 1751 a new, more decorative gate house was built along with a french garden.References:
The settlement of Trepucó is one of the largest on Menorca, covering an area of around 49,240 square metres. Today, only a small part of the site can still be seen, the two oldest buildings, the talaiots (1000-700 BCE). Other remains include parts of the wall, two square towers on the west wall, the taula enclosure and traces of dwellings from the post-Talayotic period (650-123 BCE).The taula enclosure is one of the biggest on the island, despite having been subjected to what, by today’s standards, would be considered clumsy restoration work. This is one of the sites excavated around 1930 by Margaret Murray, a British archaeologist who was a pioneer of scientific research on Prehistoric Menorca.
The houses are perfectly visible on the west side of the settlement, due to excavation work carried out several years ago. They are multi-lobed with a central patio area and several rooms arranged around the outside. Looking at the settlement, it is easy to see that there was a clear division between the communal area (between the large talaiot and the taula) and the domestic area.The houses near the smaller talaiot seem to have been abandoned at short notice, meaning that the archaeological dig uncovered exceptionally well-preserved domestic implements, now on display in the Museum of Menorca.The larger talayot and the taula stand at the centre of a star-shaped fortification built during the 18th century.