The flag was granted official status in 1959, but the red dragon itself has been associated with Wales for centuries, though the origin of the adoption of the dragon symbol is now lost in history and myth. A possible theory is that the Romans brought the emblem to what is now Wales during their occupation of Britain in the form of the Draco standards born by the Roman cavalry, itself inspired by the symbols of the Dacians or Parthians. The green and white stripes of the flag were additions by the House of Tudor, the Welsh dynasty that held the English throne from 1485 to 1603. Green and white are also the colours of the leek, another national emblem of Wales.
The United Kingdom flag was adopted in 1801 after the Union of Ireland and Great Britain. The flag is known as the Union Flag or Union Jack. The flag contains the Cross of Saint George, the patron saint of England and the Cross of Saint Patrick, the patron saint of Ireland. The crosses are coloured red with white edges and a blue background.