Rhuddlan Castle is situated in Rhuddlan, Denbighshire. Edward I constructed it in 1277, following the First Welsh War. James of Saint George, a master mason, oversaw a significant portion of the construction.
Built on a prominent site in North Wales, it superseded a neighbouring motte castle constructed in 1070. Rhuddlan is a concentric castle with a nearly square inner courtyard and a polygonal outer yard ringed with towers and bordered on three sides by a broad artificial moat and on the fourth by the River Clwyd. There are colossal twin-tower gatehouses at the east and west corners, and standalone cylinder towers at the other four corners.
The castle is closed from 7 November to 31 March.