And high on the hill in Caernarfon overlooking Wales’s most famous castle there’s Segontium, the longest-serving Roman fort in Wales garrisoned for almost the entire Roman occupation.
A fry ar y bryn yng Nghaernarfon uwchben castell enwocaf Cymru, mae’r Segontiwm, sef y gaer Rufeinig hiraf ei gwasanaeth yng Nghymru a gafodd ei garsiynu drwy gydol y feddiannaeth Rufeinig bron.