MARCH 1ST is St David's Day, the national day of Wales and has been celebrated as such since the twelfth century. So who was St David (or Dewi Sant in Welsh)? Much of what we know about St David comes from a biography written around 1090 by Rhygyfarch, a clerk of St David's. Born on a cliff top near Capel Non (Non's chapel) on the South-West Wales coast during a fierce storm, both his parents were descended from Welsh royalty. An ascetic who ate only bread, herbs and vegetables and who drank only water, David became known as Aquaticus or Dewi Ddyfrwr (the water drinker) in Welsh. As a...