The Welsh Dragon (Y Ddraig Goch) The oldest recorded use of the dragon to symbolise Wales is from the Historia Brittonum, written around 829 AD, but it is popularly supposed to have been the battle standard of King Arthur and other ancient Celtic leaders. In the Mabinogion story Lludd and Llefelys, the red dragon fights with an invading White Dragon . His pained shrieks cause women to miscarry, animals to perish and plants to become barren. Lludd, king of Britain, goes to his wise brother Llefelys in France. Llefelys tells him to dig a pit in the centre of Britain, fill it with mead, and cover it with cloth. Lludd does this, and the dragons drink the mead and fall asleep. Lludd imprisons them, still wrapped in their cloth, in Dinas Emrys, Snowdonia.