The largest group is Blegywryd  consisting of fifteen manuscripts  I  J  L  M  N  O  P  Q  R  S  T  Tim  Tr  Bost  and Ep The Blegywryd texts are from south Wales  and several of the later manuscripts show signs of editing  and often contain additional material in the form of a ‘tail’  appended to the main Blegywryd text