Holywood Priory was founded by St. Laiseran before 640 on the site of the present ruins of the medieval Old Priory. The present ruins are 12th century Anglo-Norman Augustinian Abbey built by Thomas Whyte and much of these ruins remain. After the Black death (1348-1350) Niall O’Neill refurbished the church for the Franciscan Order.
The Priory was dissolved on New Years Day, 1541, by Henry VIII with its lands passing into the hands of the O’Neill family and then to Sir James Hamilton, First Viscount Clandeboye. Hamilton laid out the town, with a maypole at the crossroads and most of the early buildings are clustered round the Priory. The tower dates from the 1800’s when this was the site of the town’s Parish Church.
The adjoining burial ground has been used for centuries. Scottish settlers who arrived with the Hamilton/Montgomery Plantation in the early 17th century are buried here, though the earliest surviving gravestone is from 1645.
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.