Seby is one of the largest burial grounds in Öland including 285 graves and stone settings. It was founded in the Roman Iron Age and used until the Viking Ages. The site consists for example of stone ship settings, cairns and tridents.
There is a significant runestone located one kilometer to the south of Seby. The inscription says “Ingjald, Näf and Sven let to erect this stone as a memorial to their father Rodmar”.
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.