Rock of Dunamase

The Rock of Dunamase, situated in the area of Dunamaise in County Laois, Ireland, originated as a settlement built by early medieval inhabitants. The site began its use in the 9th century when a hill fort, known locally as a dún—which means fort in Irish—was constructed atop the rocky hill rising prominently above the surrounding plains.

During the mid-9th century, the location witnessed Viking raids in 842 and again in 845. These attacks were significant enough to have religious repercussions, including the death of the abbot Aed son of Dub dá Chrích from the nearby monastic settlement at Terryglass. Following this turbulent period, there is no clear historical record indicating continuous occupation through the 10th and 11th centuries.

The early Norman period brought new developments to the Rock of Dunamase when a castle was erected in the latter half of the 12th century. This stronghold formed part of the network of Norman fortifications emerging after their arrival in Ireland. The castle became strategically important in the regional conflicts involving Dermot Mac Morrough, the King of Leinster, who used it during his campaigns. It also played a role in alliances formed through marriage; Dermot gave the castle as part of the marriage settlement to Richard de Clare, known as Strongbow, in 1170.

Control of the castle passed through several notable Anglo-Norman families over the subsequent centuries. After Strongbow and his wife Aoife, their daughter Isabel inherited the property, which eventually came under the stewardship of the Marshal family. Through marriage, ownership shifted to the Mortimers, a powerful English noble family, who maintained the castle until around 1330. After this point, Norman influence waned, and the castle fell into disrepair, becoming largely ruinous by the mid-14th century.

In the 15th century, the castle became the seat of the O’More (Ó Mórdha) clan, local Gaelic lords who held sway over Laois and resisted increasing English authority. The castle remained under their control until the late 16th century. Rory O’More, a notable chieftain, was among its last prominent owners before the family moved to Kildare in 1574, benefiting from land grants made by Queen Elizabeth I. Many years later, in 1650, the structure was deliberately damaged—known as slighting—to prevent its military use during the political conflicts of the period, though it did not feature in the rebellions or wars immediately preceding this.

By the late 18th century, efforts were made to adapt parts of the abandoned ruins. Sir John Parnell initiated the construction of a banqueting hall within the old castle walls, incorporating architectural elements retrieved from other medieval buildings in the area. This intervention reflected a blending of new uses with the site’s medieval heritage.