Amongst the sites associated with this period are the castles at Caernarfon, Conwy, Beaumaris and Harlech which collectively hold World Heritage site status.
Ymysg y safleoedd sy'n gysylltiedig â'r cyfnod hwn mae'r cestyll yng Nghaernarfon, Conwy, Biwmares a Harlech sydd â statws Safle Treftadaeth y Byd.