The Basilica of St. James was built in the 13th century for the Franciscans presbytery. It was built in the Gothic architecture style. The foundation of this church is related to the acquisition of the relics of Ottokar I of Bohemia. The exact location of this original church and it appearance are not known. The church was destroyed in a fire in 1689. The fire is believed to have been started by people working for Louis XIV of France.
The basilica was rebuilt in Baroque architecture style. The rebuilding included the addition of over 20 altars. Artists such as Jan Jiří Heinsch, Václav Vavřinec Reiner, and Petr Brandl created paintings for the altars. In 1702, an organ was installed. In 1974 the church was granted the honorary title of Minor basilica by Pope Paul VI.
The church is the final resting place for Count Vratislav of Mitrovice. He was accidentally buried alive in the tomb. The tomb was created by Johann Bernhard Fischer von Erlach. There is also a mummified forearm to the right of the tomb entrance, dating back over 400 years. The arm is the arm of a jewel thief who tried to steal from the high altar, which has a statue of the Virgin Mary. It is believed that when the thief tried to steal the jewels, Mary grabbed his arm and would not let go, therefore his arm was cut off by monks.
The original organ, dating from 1705, is the work of famous Czech organist Abraham Starka of Loket. Over the centuries the organ underwent changes. In 1754 the first reconstruction took place by František Katzer. Again this took place in 1906 by Josef Černý and Josef Rejna. Another intervention took place in 1941. The organ then was adapted for modern composition. The last major reconstruction was carried between 1981-82 where Starka's original sounds were restored, for the most part with the original pipes, and preserved many interesting romantic colours.
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.