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Harlech Castle is located on a spur of rock above the small town of Harlech close to the Irish Sea. It was built by Edward I during his invasion of Wales between 1282 and 1289 at a cost of £8,190.

The castle fell to the forces of Owain Glyndŵr in 1404 during the Welsh revolt against the rule of Henry IV of England. It became Glyndŵr's residence and military headquarters for the remainder of the uprising until being recaptured by English forces in 1409.

Harlech Castle is memorialised in the song 'Men of Harlech' which describes events of the seven-year siege between 1461 and 1468 during the Wars of the Roses.

The castle is a Grade I listed building and a World Heritage site being described by UNESCO as one of "the finest examples of late 13th century and early 14th century military architecture in Europe".