St Davids Holy Well

Saint David (c. 500–589) (Welsh: Dewi Sant) was a church official; he was later regarded as a saint and as the patron saint of Wales. In contrast with the other national patron saints of the British Isles, Saints George, Andrew and Patrick, David is a native of the country of which he is patron saint, and a relatively large amount of information is known about his life. However, his birth date is still uncertain, as suggestions range from 462 to 512.

http://en.wikipedia.org/wiki/Saint_David