One of the most frequently altered churches in the Loire Valley, St-Aignan was consecrated in 1509 in the form you see today. It possesses one of France's earliest vaulted hall crypts, complete with polychromed capitals. Scholars of pre-Romanesque art view the place with interest; its 10th- and 11th-century aesthetics are rare. Aboveground, the church's Renaissance-era choir and transept remain, but the Protestants burned the nave during the Wars of Religion.
In a wood-carved shrine are the remains of the church's patron saint Aignan, or Agnan(358-453). He was the Bishop of Orléans, who assisted Roman general Flavius Aetius in the defense of the city against Attila the Hun in 451.
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.