Called Aquaticus because he preferred drinking water from the Hothny River to drinking beer or wine, David was the patron saint of Wales. He was born on a cliff in a crossfire hurricane, or at least a violent storm; the Chapel of St. Non (his mom) marks the spot. Monks following him lived by his monastic rule, one apparently "more austere than Christian," according to one writer. They were vegetarians as well as teetotalers, and they pulled the plow themselves rather than using oxen. Oddly enough, his monastery thrived.
Welsh folks wear a leek to honor St. David on March 1. I'm not really sure what the correct way to wear a leek is, but they do it. If you're in Wales, check this out and let the rest of us know.