Beaumaris, Caernarfon, Conwy and Harlech were the finest castles built by King Edward I in Wales. At Caernarfon and Conwy, new towns were built within massive walls at the same time as the castles. All were begun and substantially completed between 1283 and 1330. The result, both individually and collectively, is the finest surviving example of late thirteenth-century military architecture in Europe. Together, these four great castles and two sets of town walls were inscribed on the World Heritage List in 1986 as the Castles and Town Walls of King Edward in Gwynedd World Heritage Site.
A management plan has therefore been prepared by CADW to provide a clear strategy and vision for the World Heritage Site, and guide its management for the next ten years.
This SPG has now been adopted as council policy with effect from April 2018.