Bobastro is the ruins of an old castle in the Province of Málaga. The castle was of Roman origin, but rebuilt by Umar ibn Hafsun during his rebellion against the Caliphate of Cordoba in the 9th century.
There had been a structure at the site since Roman times. In 880 AD, Umar ibn Hafsun settled in the ruins of the old castle of Bobastro near Ardales, in which he incited the muwallads and mozarabs to join his cause against the unfair, heavy taxation and humiliating treatment they were receiving at the hands of Abd ar-Rahman II and his successors. The rebels constructed a church within the castle which lasted until the end of their autonomy on January 19, 928.
In 888 AD, Al-Mundhir of Córdoba was murdered at Bobastro by his brother Abdullah ibn Muhammad al-Umawi, who later succeeded him.
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.