Henry VII displayed the red dragon of Cadwallader, from whom he claimed descent, on the Tudor colours of white and green. Until this time it. In this flag, Henry combined the dragon – already a symbol associated with the Welsh – with the green and white colours which had been used. 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. Flag Institute Tweets Recent Tweets from the Flag Institute:. It is generally agreed that resistance to the Saxons was first organized by Romans, or Romanized Britons, presumably on Roman lines Christopher Southworth22 January Murry is supposed to be between red and purple but I'm not sure of it exactly. One legend recalls Romano-British soldiers carrying the red dragon Draco to Rome on their banners in the fourth-century, but it could be even older than .