This video gives you an idea of how Caerphilly Castle would have looked in the early 1300s when it was able to withstand an attack from 10,000 Welsh rebels.
Mae’r fideo’n rhoi syniad i chi sut byddai Mae’r fideo’n rhoi syniad i chi sut byddai Siambr Gladdu Pentre Ifan yn Sir Benfro wedi edrych pan gafodd ei hadeiladu am y tro cyntaf.