Harlech Castle, located in Harlech, Gwynedd, Wales, is a concentric castle, constructed atop a cliff close to the Irish Sea. Architecturally, it is particularly notable for its massive gatehouse.
Built by King Edward I during his conquest of Wales, the castle was subject to several assaults and sieges during its period of active use as a fortification. The seven-year siege of the castle has been memorialised in the famous song, "Men of Harlech."