Local folklore claims it was built by the Knights Templars, though historical records point to a more conventional origin: an entry in the Laud Miscellany manuscripts reveals that James Butler, the 4th Earl of Ormond, constructed this tower house around 1452 or 1453, alongside the bawn of Dunmore and another castle in Thurles. By 1654, the Civil Survey described it simply as ‘a small castle at the bridge foot’, still in the possession of the Earl of Ormond and Elizabeth, the Dowager Viscountess of Thurles.

The three-storey limestone tower house, complete with attic and crenellated parapet, reveals centuries of adaptation and survival. Its ground floor now houses a drapery shop, obscuring many original features, though the bones of medieval architecture remain evident throughout. A spiral staircase in the northwest corner once provided the primary circulation route, connecting all floors from what was likely the original west wall entrance. The first floor retains its vaulted ceiling, showing traces of the original wicker centring used in its construction, whilst the upper levels feature a fascinating array of medieval comforts; garderobe chambers, ogee-headed windows, and even a defensive murder hole positioned directly above the main entrance, complete with slots for a wooden trapdoor.

Perhaps most intriguing are the architectural details that speak to both defensive necessity and domestic comfort. The attic level showcases elaborate stone corbelling on the east and west walls, with the eastern example featuring a particularly ornate central corbel supporting carefully dressed stone blocks. The southern gable gains additional support from a double arcade resting on a pyramidal corbel with broach stops, demonstrating the sophisticated engineering of late medieval Irish tower houses. Whilst modern alterations include replacement timber flooring and a contemporary A-frame roof, the stepped crenellations of the parapet remain largely original, save for some heightening on the western side. The tower’s connection to Thurles’ town walls is still visible where the arch of the eastern gate springs directly from the castle’s north wall, physically linking this private fortification to the broader defensive network of the medieval town.