The Palazzo dei Normanni (Norman Palace) was the seat of the Kings of Sicily during the Norman domination and served afterwards as the main seat of power for the subsequent rulers of Sicily. The building is the oldest royal residence in Europe; and was the private residence of the rulers of the Kingdom of Sicily and the imperial seat of Frederick II and Conrad IV. The palace stands in what is the highest point of the ancient centre of the Palermo.
The first building, the al-Qasr (in Arabic, castle or palace) is believed to have been started in the 9th century by the Emir of Palermo. Parts of this early building are still visible in the foundations and in the basements, where typical Arabian vaults are present. After the Normans conquered Sicily in 1072 and established Palermo as the capital of the new County of Sicily, the palace was chosen as the main residence of the kings. The Norman kings transformed the former Arabian palace into a multifunctional complex with both administrative and residential aims. All the buildings were linked to each other via arcades and enclosed by gardens, designed by the best gardeners of the middle east. In 1132 King Roger II added the famous Cappella Palatina to the complex.
During the reign of the Swabian emperors, the palace maintained its administrative functions, and was the centre of the Sicilian School of poetry, but was seldom used as permanent seat of power, especially during the reign of Frederick II.
The Angevin and Aragonese kings preferred other seats. The palace returned to an important administrative role in the second half of the sixteenth century, when the Spanish governors chose it as their official residence, carrying out important reconstructions, aimed at their representative needs and their military ones, with the creation of a system of bastions.
The Spanish Bourbons built additional reception rooms (la Sala Rossa, la Sala Gialla e la Sala Verde) and reconstructed the Sala d'Ercole, named for its frescos depicted the mythological hero, Hercules.
The palace contains the Cappella Palatina, by far the best example of the so-called Arab-Norman-Byzantine style that prevailed in the 12th-century Sicily. The wonderful mosaics, the wooden roof, elaborately fretted and painted, and the marble incrustation of the lower part of the walls and the floor are very fine. Of the palace itself the greater part was rebuilt and added in Aragonese times, but there are some other parts of Roger's work left, specially the hall called Sala Normanna.
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.