Harlech Castle in Harlech, Gwynedd, Wales, is a Grade I listed medieval fortification built onto a rocky knoll close to the Irish Sea. It was built by Edward I during his invasion of Wales between 1282 and 1289 at the relatively modest cost of £8,190. Over the next few centuries, the castle played an important part in several wars, withstanding the siege of Madog ap Llywelyn between 1294 and 1295, but falling to Prince Owain Glyndŵr in 1404. It then became Glyndŵr's residence and military headquarters for the remainder of the uprising until being recaptured by English forces in 1409. During the 15th-century Wars of the Roses, Harlech was held by the Lancastrians for seven years, before Yorkist troops forced its surrender in 1468, a siege memorialised in the song "Men of Harlech". Following the outbreak of the English Civil War in 1642, the castle was held by forces loyal to Charles I, holding out until 1647 when it became the last fortification to surrender to the Parliamentary armies. In the 21st century the ruined castle is managed by Cadw, the Welsh Government's historic environment service, as a tourist attraction, and since 2024 under its Welsh name only.
UNESCO considers Harlech, with three others at Beaumaris, Conwy and Caernarfon, to be one of "the finest examples of late 13th century and early 14th century military architecture in Europe", and it is classed as a World Heritage Site. The fortification is built of local stone and concentric in design, featuring a massive gatehouse that probably once provided high-status accommodation for the castle constable and visiting dignitaries. The sea originally came much closer to Harlech than in modern times, and a water-gate and a long flight of steps leads down from the castle to the former shore, which allowed the castle to be resupplied by sea during sieges. In keeping with Edward's other castles in the north of Wales, the architecture of Harlech has close links to that found in the County of Savoy during the same period, an influence probably derived from the Savoy origins of the main architect, James of Saint George.
In local mythology, the site of Harlech Castle in North Wales is associated with the legend of Branwen, a Welsh princess, but there is no evidence for a native Welsh fortification having been built there. The kings of England and the Welsh princes had vied for control of North Wales since the 1070s and the conflict was renewed during the 13th century, leading to Edward I intervening in North Wales for the second time during his reign in 1282. Edward invaded with a huge army, pushing north from Carmarthen and westwards from Montgomery and Chester. English forces advanced down the Conwy valley and through Dolwyddelan and Castell y Bere, onto Harlech, which Sir Otton de Grandson took with 560 infantry in May.
The site of Siege of Harlech Castle (1461–1468) lies on Lower Cambrian Rocks (Undifferentiated), bedrock that formed in the Early Cambrian. The rock here is sandstone and conglomerate, interbedded.
The most striking detail of this siege is its sheer duration. For seven unbroken years the Lancastrian garrison of Harlech Castle held out against Yorkist pressure, sustained in part by the castle's remarkable water gate, a passage leading down from the fortress to the former shoreline that allowed supplies to be brought in by sea even while the landward approaches were contested. It was this capacity for maritime resupply, built into the fabric of the castle by its original Edwardian designers two centuries earlier, that transformed Harlech into a byword for defiant endurance, and it is that endurance which the song "Men of Harlech" is traditionally held to commemorate.
This page covers Siege of Harlech Castle (1461–1468). A full Aubrey report for the area pulls together this battle alongside scheduled monuments and everything else the record holds within a few miles:
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