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.
Gyda'i gilydd, cafodd y pedwar castell hwn a dau fur tref eu harysgrifo ar Restr Treftadaeth y Byd yn 1986 fel Safle Treftadaeth y Byd Cestyll a Muriau Trefi'r Brenin Edward yng Ngwynedd.