The first church built in Hossmo was most likely a wooden one. Coffins found show that there was probably a church here already in the 11th century. The construction of that church has been linked to the royal court or a powerful local family. Hossmo is considered to have been the centre of a region in the late Iron Age or early Middle Ages. The church was probably built as a royal demesne or a church for a powerful leader.
However, in the conflict between Christianity and the old paganism, a wooden church was far too vulnerable, and was replaced by a stone church. This happened about 1120, and during the 13th century, the church was rebuilt with fortifications. Several written sources show that the church was used as garrison and flank defense for Kalmar during the Union conflicts in the early 16th century, Most of what we now see inside the church dates back to the 18th and 19th century. The belfry was completed in 1670.
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.