Baeza is a city and municipality of Spain belonging to the province of Jaén. It is now principally famed for having some of the best-preserved examples of Italian Renaissance architecture in Spain. Along with neighbouring Úbeda, it was added to UNESCO's list of World Heritage Sites in 2003.
Established in the Roman times, the sixteenth century was the golden era of Baeza (and nearby Úbeda). It grew rich from several industries, notably textiles, and the noble families, which were well connected with the Spanish Imperial state. They hired major architects of the era to design the present cathedral, churches, public buildings, and private palaces in the then-fashionable Italian style. The town's university building dates to 1533. The city declined in importance in the seventeenth century, with the only remaining industry consisting of local production of grain and olive oil. As few newer structures were built during this period, this had the effect of preserving the town's Renaissance legacy.
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.