Fullösa Church was built in the 1100s. The sacristy and porch were added later in the Middle Ages and windows were enlarged in 1600-1700s. The most interesting sight in the church are mural paintings made in Baroque style in 1630s. The artist was Gullick Gullicksson, who also painted murals to near churches and Läckö castle. The altar dates from 1600s. There are two cuppas dating between 1100 and 1250. The Baroque pulpit dates was made in 1686.
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.