Aros castle was probably built by one of the MacDougall Lords of Lorn in the 13th century and was once the major stronghold of the Lords of the Isles. It first comes on record in the later 14th century when it was in the possession of the Lords of the Isles. It appears to have been garrisoned by Argyll’s troops in 1690, though it was described two years previously as ‘ruinous, old, useless and never of any Strength’. Throughout the 18th century the lands of Aros were farmed by a succession of Campbell tacksmen, but there is no record of the castle having been inhabited at this period.
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.