Fredrikskyrkan (translation, 'Frederick's Church') construction began in 1720 as a replacement for the city's temporary wooden church, Hedvig Eleonora Church. The church was consecrated in 1744. Fredrikskyrkan was built in the baroque style after a design by Nicodemus Tessin the Younger. Though Crown Prince Adolf Frederick was present for the event, the building was named in honor of Frederick I. The spires atop the church towers were completed in 1758. There has been several restorations. The one in 1805-06 was led by architect Olof Tempelman. Interior restorations occurred in 1913-15 under Axel Lindegren, and there was another in 1967-68.
Fredrikskyrkan's towers are a notable feature. The carillon is housed in the south tower, and there are 35 bells, which were installed in 1967 by the Bergenholtz bell foundry in Sigtuna. The clock chimes three times a day.
The 1854 pulpit is in a neoclassical style by the design of architect Johan Adolf Hawerman; it predates the altar. The carved wood baptismal font was donated by the ship builder Gilbert Sheldon. The church silver is preserved in a massive safe.
The church's first organ came from Hedvig Eleonora Church. When a decision was made to purchase a larger and more suitable organ,Lars Wahlberg received the contract to build an organ with 29 stops, 2 manuals and a pedal. When it was finished in 1764, he had inserted the 34 voices that are driven by six large bellows. Wahlberg's organ was replaced in 1905 by one built by Åkerman & Lund Orgelbyggeri in Stockholm; it was reconstructed in 1982-87 by Grönlunds Orgelbyggeri.
Situated on Stortorget, the main square in the city centre, Fredrikskyrkan is included within the Karlskrona UNESCO World Heritage Site.
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.