The Welsh God DEWI - Most People do not realize that the Welsh Dragon actually is an ancient Welsh God The Red Dragon of wales Derived from the Pagan God, Dewi. Dewi, whose crimson form was said to have appeared in King Arthur's dreams, has been depicted on the Welsh banner since at least the departure of the Roman legions, is the official emblem of Wales, and was derived from the Great Red Serpent that once represented Dewi. (Read more in th comments below.)
The Welsh Dragon – ("the red dragon") – appears on the national flag of Wales. The flag is also called Y Ddraig Goch. The oldest recorded use of the dragon to symbolise Wales is in the Historia Brittonum, written around AD 829, but it is popularly supposed to have been the battle standard of King Arthur and other ancient Celtic leaders.