In Wales, its flame petered out in the early 5th century, ushering in what became known as the ‘Dark Ages’.
Yng Nghymru, diffoddodd ei fflam yn raddol tua dechrau’r 5ed ganrif, gan hebrwng oes newydd i mewn, a fyddai’n cael ei galw ‘yr Oesoedd Tywyll’.