Overview
Prince William’s Seat rises to 555 m (1,821 ft) on the northern edge of the Glencree valley, marking the boundary between County Wicklow and County Dublin. It sits within the Wicklow Mountains National Park and is a favourite day‑trip for Dublin walkers because the ascent is short, the terrain varied and the panorama is spectacular. From the trig point at the top you can see the Great Sugar Loaf, Bray Head, Dublin Bay, Kippure and the rolling Wicklow hills beyond.
History
The name most likely commemorates Prince William, brother of King George IV, after his 1821 royal visit to Ireland. Earlier maps record the area as the “Commons of Ballynulty”. Local tradition also knows the summit as “Glencullen Mountain” (1821 map), “The Fool Stone” (1816 Powerscourt estate map) and the Irish‑derived “Clusnaspeire”. Nearby Knocknagun bears a granite tor historically called Fitzwilliam’s Seat, used by 16th‑century hunting parties. The concrete trig pillar dates from the 1960s retriangulation of Ireland, but the site may have served as an observation post as early as the 1830s.
Part of the Wicklow Way
The Prince William’s Seat loop forms a well‑marked section of the Wicklow Way – Ireland’s oldest way‑marked long‑distance trail (established 1981). Walkers often combine the climb with the preceding forest walk from Marlay Park (Dublin) and the following descent into the Glencree valley, making a continuous 21.7 km stage that links Dublin to Knockree. Yellow “walking man” symbols guide the route through conifer forest, open heath and the summit ridge.
What to See & Do
The most popular way to experience Prince William’s Seat is the 10.5 km (6‑mile) loop that starts at the forest car‑park on the Boranaraltry Bridge in Glencullen (also known as the Cloon Curtlestown Wood car‑park). The walk climbs steadily through conifer‑planted forest, then opens onto heathery slopes dotted with bilberry and heather. Mid‑way you reach the summit of Knocknagun, where the granite tor of Fitzwilliam’s Seat dominates the landscape. From there the ridge continues to Prince William’s Seat, offering a 360° outlook that includes:
- The Great Sugar Loaf and Bray Head to the east.
- Dublin Bay and the city skyline on clear days.
- The higher Wicklow peaks such as Kippure to the south.
- The distant Irish Sea beyond the horizon.
At the summit a trig point marks the highest spot and provides a convenient place to pause, have a snack, and soak in the view. The loop then descends gently, re‑entering the forest tracks and returning to the car‑park. The trail can become very muddy after rain, especially on the grassy sections near the summit.
Optional side‑loop – Raven’s Rock
A short detour east of the main summit leads to Raven’s Rock, a rocky outcrop with additional 360° views. The side‑loop adds roughly 1 km and is highlighted in the Scenic Irish Walks guide.
Seasonal Flora
Spring brings pink foxgloves and purple heather across the heath, while early summer adds a carpet of bilberry. Autumn colours turn the slopes golden, making the walk especially photogenic.
Mountain Biking
For experienced riders the Prince William’s Seat & Knocknagun loop can be tackled on bike. The Komoot‑listed route starts and finishes in Enniskerry, covering about 30.2 km with 820 m of ascent. It is rated difficult and includes sections of single‑track, alpine terrain and boggy ground that may require you to push the bike. Suitable for riders with good fitness and advanced handling skills. Parking is available in Enniskerry village; from there the trail follows the same forest tracks before opening onto the open ridge.
Practical Information
Distance & Duration – The walking loop is approximately 11 km (7 mi) with an elevation gain of about 443 m (1,450 ft). Most walkers complete it in 3–4 hours; experienced hill‑walkers can manage it in around 2 hours. The mountain‑bike version is about 30 km and takes roughly 3 hours for a fit rider.
Starting Point – Free parking at the Boranaraltry Bridge car‑park in Glencullen. The site is well sign‑posted from the R116 and reachable by Dublin Bus 44 to Glencullen village, followed by a short walk to the trailhead.
Public Transport – Dublin Bus 44 serves Glencullen; the nearest train station is Bray, with a local bus connection to the village.
Season – Open all year. Spring and early summer bring vibrant heather; autumn adds golden hues. Winter walks are feasible but the exposed summit can be icy and the boggy sections may be treacherous.
Navigation – The route is marked on OS maps and is available as a GPX file on MountainViews and GPS‑Routes. Offline maps can be downloaded via the Hika app (IGN/Swisstopo layers).
Facilities – No built‑in facilities on the summit; carry water and snacks. The forest car‑park provides basic litter bins.
Dog Policy – Dogs are permitted but must be kept under control, especially near the open summit where wildlife may be present.
Accessibility – The ascent involves uneven ground, rocky sections and moderate gradients, making the walk unsuitable for wheelchair users or those requiring a fully paved path.
Buggies – The trail is not suitable for push‑chairs or buggies (as noted in the Scenic Irish Walks guide).
Nearby Extensions – After completing the loop, walkers can continue onto the Glencree River and Millennium Wood Loop, the Barnaslingan and Carrickgollogan Walk, or the Ticknock Forest Walk, all of which start from the same car‑park.
Post‑walk Refreshments – A short walk into Glencullen village leads to John nie Fox’s Pub, famed as “Ireland’s highest pub”, offering traditional music and a hearty meal.
Safety – The exposed summit can be windy. Carry a map, a fully charged phone and let someone know your expected return time. In wet conditions the boggy sections near Knocknagun become slippery.
Cost – Access to the trail and parking are free of charge.
Further Reading – Detailed route information, GPX files and user reviews are available on MountainViews and the GPS‑Routes website.
Prince William’s Seat offers a blend of natural beauty, gentle challenge and a touch of history, making it an ideal half‑day adventure for families, casual walkers and peak‑baggers alike.