The church of Saint-Martin was first built between 1468 and 1472 on a site opposite the castle of Pau. In the 19th century, the church was too small for the population of Pau and was replaced in 1871 by a new church located a little further east. It was therefore decided to demolish the old church in 1885. The church tower was partially destroyed in 1794, then rebuilt in wood in 1805 before being completely rebuilt when the new Saint-Martin church was built. The new building is of neo-Gothic architecture with a Byzantine influence.
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.