Castles And Town Walls Of King Edward In Gwynedd

Four castles, not five, and no monastery hiding among them. This UNESCO inscription covers exactly Beaumaris, Caernarfon, Conwy, and Harlech, plus the surviving town walls at Caernarfon and Conwy. There’s no “Castell Aberleirion” anywhere in the designation, and no Edward I fortress that was later converted into a Henry VII-era monastery; that description doesn’t correspond to any real site in Gwynedd and appears to be a fabrication that’s crept into other guides. If a tour itinerary lists a fifth castle by that name, cross it off.

The man behind all four

Edward I invaded North Wales in 1282 after conflict with the Welsh princes escalated, and he ordered a ring of fortresses built to lock down his conquest for good. The real credit for the engineering, though, belongs less to Edward and more to Master James of St George, a military architect from Savoy whom Edward brought in specifically for this project. James directed construction at Harlech, Conwy, and Caernarfon, refining a “walls within walls” concentric design with each successive castle. Harlech went from bare ground to finished battlements in just seven years, 1282 to 1289, at a cost of roughly 8,190 pounds, about a tenth of everything Edward spent on Welsh castle-building between 1277 and 1304.

What sets each one apart

Conwy, built between 1283 and 1289, is unusual for having its town walls survive almost completely intact alongside the castle, giving you a rare continuous circuit walk around an entire medieval town. Caernarfon, begun in 1283 and not fully finished until 1323, was deliberately built with polygonal towers and banded stonework echoing the walls of Constantinople, a symbolic move meant to link Edward’s new fortress to imperial Rome. Edward’s son, the future Edward II, was born there in 1284, which the castle’s promoters later used to cement its symbolic role as the birthplace of English princes tied to Wales. Beaumaris, started in 1295, is the most geometrically perfect of the four, a textbook concentric design of nested squares and rings, but it was never actually finished. Money and labor ran out, and what stands today is an unusually pure, uncluttered ruin precisely because nothing was ever added on top of the original medieval plan. Harlech’s defining feature is its site: it sits on a sheer rock outcrop that used to have the sea lapping directly against its base before the coastline receded, and a restored footbridge now lets you enter the way Master James intended, for the first time in roughly 600 years.

Practical visiting details

All four sites are managed by Cadw, the Welsh government’s heritage body, and 2026 marks the fortieth anniversary of the whole ensemble’s 1986 UNESCO inscription, with restoration work underway on Conwy’s town walls and on Caernarfon’s Eagle Tower using traditional lime mortar and locally sourced stone. Harlech’s adult admission runs around 10.40 pounds; a Cadw Explorer Pass is worth buying if you’re doing all four, since it covers entry to all twenty staffed Cadw sites and pays for itself after two or three castle visits. Cadw is also passing through a reduced VAT rate as part of a government summer savings scheme running from late June through early September 2026, so prices dip slightly during that window. Book online where possible; it tends to be a few percent cheaper than paying on arrival.

Timing and crowds

Harlech has genuinely limited on-site parking, and arriving after mid-morning during summer school holidays often means circling for a spot. Get there before 10am if you can. Caernarfon and Conwy, being embedded in working towns, draw heavier day-trip crowds off coach tours, particularly midday. Beaumaris, oddly, is the quietest of the four despite being the most architecturally textbook example, since it sits slightly off the main coastal road route most visitors follow between Conwy and Caernarfon.

Nearby, and worth an hour if you have time, is Segontium, a Roman fort on the edge of Caernarfon that predates Edward’s castles by more than a thousand years and shows the site was strategically valuable long before the Plantagenets arrived. Bring a windproof jacket regardless of the forecast; the clifftop at Harlech in particular is exposed enough to make even a sunny day feel raw.