What year was King Arthur was born?

Actually, the original Arthur Angus Pendragon was born on September 9, 1424 - but due to the nature of his conceivement, he was noted as heir to the Pendragon throne... even though his father was not royalty. His father was one of Uther Pendragon's Palace guards. Merlin himself helped the guard commit adultery to consummate Arthur's birth.

-Xapirteraziz