Overview
The Rock of Dunamase is a 46-metre limestone crag rising straight out of the flat Laois plain, with the ruins of a medieval castle spread across its top. It sits midway between Portlaoise and Stradbally, just off the N80, and it is free to visit and open in daylight hours all year. The Office of Public Works looks after it as a national monument, but there is no staff and no ticket desk: you park, you climb, you have the place largely to yourself outside of sunny weekends.
If you only have twenty minutes, walk straight up to the upper ward. That is where the view opens out across the plain to the Slieve Bloom Mountains and south towards Carlow, and it is the single reason most people make the stop.
A layered history
The rock has been fought over for more than a thousand years. The earliest settlement was a 9th-century drystone dún (fort) guarding the plain – the name Dún Másc means ‘the fort of Másc’. Annals record a Viking raid in 845, and excavations in the 1990s turned up a silver penny and sections of the original fort wall.
The site changed for good in the late 12th century. Diarmait Mac Murchada, King of Leinster, granted the rock to his daughter Aoife as part of her dowry when she married the Norman leader Richard de Clare, known as Strongbow, in 1170. Strongbow raised the first stone defences, turning the crag into one of the most important Anglo-Norman strongholds in Laois. Through marriage the castle passed to William Marshal, Earl of Pembroke, and later to the Mortimers.
By the 1300s the castle was in decline, and the native Ó Mórdha (O’Moore) clan regained control at some point over the following century – the sources disagree on exactly when. The final blow came during the Cromwellian campaigns of the 1650s, when the walls were deliberately slighted to make the fortress useless. In the 1700s Sir John Parnell tried to convert the ruins into a Gothic-revival banqueting hall, importing carved stone from other sites, but the project was abandoned. What survives today is that layered wreck: Norman defences, later rebuilding, and deliberate destruction, all stacked on the one crag.
What to see
Walking up, you trace the outline of a proper medieval fortress. The path climbs through the ruined gatehouse and a series of defensive ditches designed to funnel attackers into exposed ground, past the lower ward, and up to the upper ward at the summit. The masonry is roofless and weathered, but the scale is still legible – enough to picture the fortress that stood here.
The summit is the payoff. On a clear day the view runs across the Laois plain to the Slieve Bloom Mountains in the west and towards Carlow to the south. Bring a jacket: the top is exposed and catches the wind, and the limestone gets slippery after rain.
Two films have used the rock as a backdrop: Disney’s Darby O’Gill and the Little People (1959) and Leap Year (2010).
Getting there and parking
The monument is signposted off the N80 between Portlaoise and Stradbally. There is a small free car park at the base of the hill, near the church opposite the castle. It holds only a handful of cars and fills quickly on sunny weekends, so come early. One real caveat: the parking is tight against the road and you may have to cross it to reach the path, so mind the passing traffic – the OPW flags it as a genuine hazard.
From the car park a gravel track leads up to the gate, finishing with a steep incline and a short flight of stone steps. Allow an hour to an hour and a half for an unhurried visit. Regular buses serve Portlaoise and Stradbally, both within a 15-minute drive, but there is no direct public transport to the rock itself.
Nearby
The rock pairs well with a walk in the Slieve Blooms: the Glenbarrow waterfall and loop is the obvious combined stop, and many people break the drive to it at Dunamase. Closer to hand, Emo Court is a neo-classical mansion with landscaped grounds, and the Irish National Stud and its Japanese Gardens are an easy add-on. History-minded visitors can carry on to the Timahoe Round Tower or follow the Laois Heritage Trail between the county’s archaeological sites.
Come in the late afternoon if you can. The low sun rakes across the stonework and picks out the texture of the walls, and the weekend crowds have usually thinned by then.