The Welsh Flag

Y Ddraig Goch (Welsh for the red dragon) appears on the national Flag of Wales and is the most famous dragon in Britain.

In the Mabinogion story Lludd and Llefelys, the red dragon fights with an invading white dragon. His pained shrieks cause women to miscarry and animals 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 in Snowdonia.

The tale is taken up by Nennius in the Historia Britonum. The dragons remain at Dinas Emrys for centuries until King Vortigern tries to build a castle there. Every night the castle walls and foundations are demolished by unseen forces. Vortigern consults his advisers, who tell him to find a boy with no natural father, and sacrifice him. Vortigern finds such a boy (who is later, in some tellings, to become Merlin) who is supposed to be the son of a demon. On hearing that he is to be put to death to solve the demolishing of the walls, the boy dismisses the knowledge of the advisors. The boy tells the king of the two dragons. Vortigern excavates the hill, freeing the dragons. They continue their fight and the red dragon finally defeats the white dragon. The boy tells Vortigern that the white dragon symbolises the Saxons and that the red dragon symbolises the people of Vortigern. If Vortigern is accepted to have lived in the fifth century, then these people are the British whom the Saxons pushed back to the edges of Britain and who are today called the Welsh.