Valleberga Church is the only known fortified round church in Scania. It was built of limestone in the middle of the 12th century. A reason for the building of the round church was that the master mason of the church, Carl Stenmester, also built churches on Bornholm, where round churches were common. The font was cut by the master of Tryde and shows one of the legends about Saint Peter and Paul of Tarsus.
In 1791, the round church was demolished and extensions were made to the north, west and south. These extensions were demolished in 1908-1910 when the round church was restored and a large cathedral-like extension was made to the west, including a new tower.
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.