Celtic Dragon

symbolism to celtic design of dragons around a cross?

in my ongoing search for celtic designs, i recently stumbled across an image of two dragons perched/twisting around an ornate cross. they sit differently in different versions that i have found, seeing as i found several versions. i had never seen it before though. is it a common image? what is the symbolism? could it represent the battle for good and evil (sometimes one dragon is red and the other white). i dont know a whole lot about celtic legend, so i dont know what the dragon means. any insight would be appreciated. thanks!
this is one example

In British mythology, Merlin interprets a vision of two dragons fighting in the skies of Britain – One White Dragon and One Red Dragon.

The white dragon was to represent the Saxon invaders while the red dragon is the native Britian defender. Vortigern had invited the Saxons into Britain for his own profit.

Merlin’s interpretation is that the Red Dragon would kill the White Dragon (the natives would get rid fo the invaders) but that the Red Dragon would dies from the wounds suffered in the battle (Vortigern was going to lose his place as king and, possibly, his life).

The old Welsh DRAGWN (dragon) also meant leader While the Brythonic word PEN meant head.

Uther took the title PENDRAGON to mean chief leader, a term Arthur also used, using the Red dragon of Wales on his battle standard.

The cross in the middle would refer to the idea that Arthur was instrumental in bringing Christianity to Britain, thus turning the struggle between the two dragons to mean the fight to make Britain a Christian nation.

Red versus White is a popular theme in British symbolism, these being the color of two ruling and often warring houses of Britain – York(White) and Lancaster (Red) – thus the War of the Roses (depicted often with a red rose and a white rose) is the war between the houses of Lancaster and York.

Interestingly enough, the house of Tudor which supplanted both prior houses uses a Tudor rose, which is both Red and White.

More than you wanted to know.

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