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. With defence in mind, the castle had pyramid and single pitch roofs with several towers and gates. The round window openings and friezes in the solid walls made the castle an artistic highlight of the Upper Danube valley.
No building remains of note have been left behind from the 13th and 14th centuries. Only in the 15th century did a new building period begin at the castle under the eminent and architecturally-minded Count of Werdenberg. The Werdenbergs expanded the building to the north-east. Only the lintel engraved with the year 1498, which is part of the Swedish Tower, now remains. A few years later, the building was expanded to the west.
The third building period began during the time of Count Charles II of Hohenzollern-Sigmaringen (1576-1606). Under the supervision of master builder Hans Alberthal of Dillingen, the castle underwent widescale transformation between 1627 and 1630 and went from being a castle to being a Renaissance château.
In around 1650, the two separate buildings from the Werdenberg period were brought together under one roof by master builder Michael Beer of Au in the Bregenz Forest.
Only minor renovation and building work was carried out during the 18th century. The ancestral hall was established within the castle in 1736 (renovated in 1879). During the years 1860/1880, neo-Gothic style changes were made under royal master builder Josef Laur. The castle was extensively redesigned following the great fire of 1893 during which almost the entire castle was destroyed. The work was carried out by royal architect Johannes de Pay and primarily by Munich architect Emanuel von Seidl in a historicist or eclectic style.
The Portuguese Gallery, which encloses the inner courtyard of the castle on the side facing the city, was completed in 1902 and marked the end of this period of alterations.
References:Château de Niort is a medieval castle in the French town of Niort. It consists of two square towers, linked by a 15th-century building and dominates the Sèvre Niortaise valley.
The two donjons are the only remaining part of the castle. The castle was started by Henry II Plantagenet in the 12th century and completed by Richard the Lionheart. It was defended by a rectangular curtain wall and was damaged during the Wars of Religion. In the 18th century, the castle served as a prison.
The present keeps were the central point of a massive fortress. The southern keep is 28m tall, reinforced with turrets. The northern tower is slightly shorter at 23m. Both are flanked with circular turrets at the corners as well as semicircular buttresses. Each of the towers has a spiral staircase serving the upper floors. The Romanesque architecture is of a high quality with the dressed stones closely jointed.