The modifications at White Castle, his first Welsh castle, can be seen as a forerunner of the mighty fortresses he would go on to build in north Wales.
Gellir gweld ei addasiadau yn y Castell Gwyn, ei gastell cyntaf yng Nghymru, yn rhagflaenu’r caerau nerthol y byddai’n eu hadeiladu maes o law yng ngogledd Cymru.