The oldest part of Lovö Church has been dated back to the later part of the 12th century. According Berit Wallenberg it was built as early as the 11th century. It is also believed that an even older wooden church existed on this site. Church sermons are held in the church, normally once a month, and for certain Christian holidays.
The church is unusually small and narrow. It was extended to the east, first in the 13th and further in the 17th century. Churches built during this time were built with a weapons room, a foyer where people going to church had to lay down their arms before entering the church itself. This weapons house was demolished in 1798, and an entry was made in the west side of the attached church tower. There are also five Viking Age memorial runestones that are located outside the Lovö church.
The sanctuary of the church was created around 1670. The architect is believed to be Nicodemus Tessin the Elder, who was working on Drottningholm Palace around this same time. Inside the church are 30 gravestones, several of which belonged to people employed at Drottningholm palace. The interior was renovated in 2004.
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.