Saint David and Saint David's Day - A biography of the Welsh patron saint with personal recollections of celebrating his feast day as a school child in Wales. St David, Archbishop, Patron of Wales - From Alban Butler's Lives of the Saints. Dewi of Wales - Biography. With prayer in traditional and contemporary language. Catholic Encyclopedia: St. David - Also known as Dewi or Degui. Biography of this bishop and confessor, the patron saint of Wales. St. Dewi, Bishop of Mynyw - Extended biography of the patron saint of Wales. Dydd Dewi Sant - About St. David and St. David's Day (1 March) as observed in Wales. CatholicSaints.Info: David of Wales - Illustrated profile.