Upon the haunted misty hills
Of Dinas Emrys
Back twelve hundred years
The castle shall tumble down
Again and again
Lashed by the rain
King Vortigern’s fears
As the lightning strikes down

Two dragons shall fight
One red and one white
Deep under the earth
Below the lands of Beddgelert
The red shall come forth
With spectacular might
With fire from his heart
Will strike down the white

Owain Glyndwr
Rise from your slumber
Hold up your sword
And keep to your word
The Saxons are finished
Their power diminished
But the dragon below
Will breathe and bestow
His flames on their horde

My dear Ambrosius
Throw forth your power
A wizard so strong
To bear down your song
Another twelve hundred years
To wait is not long
To stand before Wales and protect her
As we all now know
The Red Dragon shall be the victor

Maurice Rowlands

http://www.poemhunter.com/poem/y-ddraig-goch/