According the first written record Gumlösa Church was inaugurated by archbishop Absalon of Lund in 1191. It is the oldest church in the Nordic countries built of brick. The vaulting and the tower were built already to the original church, which has been very unusual. The top of the tower was added in the 14th century.
Due the documents there were even 96 relics in Gumlösa church in the Middle Ages. The font, made of sandstone, dates from the 1100s. The other interior was mainly destroyed by fire in 1904.
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.