This mid thirteenth century Norman castle, next to the River Clwyd, has inner wards with twin tower gatehouses in defensive walls. The outer ward is behind a curtain wall with turrets and towers. The site is where Edward I in 1284 issued a document setting up the government of Wales under his rule. The last military action seen here was when Parliamentary forces took the castle in the English Civil War. The site is south of Rhyl on the A525/A547.