The standard bears a marked similarity to the arms of Llewelyn ap Gruffydd, the flag of the royal house of Gwynedd. Llewelyn was the last prince of Wales prior to its conquest by Edward I.

the Britons were driven back towards Wales. By the seventh century, it was known as the red dragon of Cadwallader, after Cadwaladr ap Cadwallon, legendary king of Gwynedd. The main standard of the ...