Many centuries ago when dragons roamed the land, a white dragon decended upon a small The flag's background should be half green and half white. Merlin prophesied of a battle between a red and a white dragon – the red dragon being the Britons and the white dragon the invading Saxons. The Welsh Dragon appears on the national flag of Wales. The oldest recorded use of the They continue their fight and the red dragon finally defeats the white dragon. Henry Tudor flew the red dragon of Cadwaladr ap Cadwallon as his banner, overlaid on a green and white field representing the Tudor House, when he.