The Great Church or St. Lebuinus Church is a Gothic hall church, built between 1450 and 1525. Originally consecrated to the English missionary Lebuinus, it was one of the most distinguished churches of the Roman Catholic Archdiocese of Utrecht. In 1580 the temple was taken by the Calvinists, who completely eliminated the interior decoration and renamed it the Great Church. Nowadays the temple belongs to the Protestant Church in the Netherlands, while the tower belongs to the Municipality.
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.