Re Nonna and St David: Vita S. David. Rhigyfarch's Life of St David, ed. J.W. James (1967 - I suspect the place of publication might be Cardiff, but I can't check the reference fully at the moment). There is also a translation by A.W. Wade-Evans Y Cymmrodor, xxiv (1913), 1-73. Hope this helps Julia Barrow %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%