Especially when you consider that King Edward I and his architect Master James of St George built both castle and walls in a barely believable four years between 1283 and 1287.
Yn enwedig o ystyried bod Brenin Edward I a’i bensaer James o San Siŵr wedi adeiladu’r castell a’r waliau mewn pedair blynedd anhygoel rhwng 1283 a 1287.