The origins of the Red Dragon flag, or "y Draig Goch", could date back to the Roman period, when the dragon (or draco) was used by Roman military cohorts at the time of the Emperor Trajan.

SAINT George’s Day is a day of celebration across England, as people celebrate the history of the country ... s flags. The St George’s Flag is a simple design consisting of a red cross ...

Henry Tudor - shortly to be Henry VII - flew the red dragon of Cadwallader, from whom he claimed ancestry, on the white and green Tudor colours. It was the beginning of the flag as we know it today.