St. David is the patron saint of Wales. Legend claims he was born around 500 A.D. on the rugged Pembrokeshire coast of southwest Wales. He was the founder of a strict monastic order in the town that bears his name, and was the most influential clergyman in all Wales during the "Age of Saints." His place of birth and the cathedral built in his name became one of the most important shrines of medieval Christendom - two pilgrimages to St. Davids equaling one to Rome.

http://www.castlewales.com/stdavid.html