Kirkistown Castle is an impressive three-storey tower house, built in 1622 by Roland Savage, a Norman landlord, at the site of a ninth-century round tower. It was occupied until 1731, when it was deserted. It post-dates the Plantation, but is fully in the late medieval tower-house tradition. Parts of the bawn wall survive with three-quarter round flanker towers at the angles. The tower was remodelled in Gothic style in 1800 by a Col. Johnston, and in 1836 some further work was performed by a very young Master Montgomery of Grey Abbey. The building was left, however, with a partial roof and broken windows, and the elements soon returned it to disrepair.
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.