Iddawc Cordd Prydain

   The treachery of Iddawc or Eiddilig Cordd Prydain, (possibly Gordd Prydain, the hammer of Britain) is the subject of more than one of the Triads where he is said to have betrayed Arthur by divulging his plans. The meeting between him and Medrawd, with their men at Nanhwynain before the battle of Camlan, is spoken of as one of the three traitorous meetings of the Island, for there they plotted the betrayal of Arthur, which occasioned the strength of the Saxons. In another place the Saxon ascendancy is attributed to Iddawc's magical arts, which there were not warriors in the Island capable of withstanding, so that the Saxons prevailed. This magic, for which he is also greatly celebrated, was taught him by Rhuddlwm Gawr.
   The Triad which ranks Iddawc Cordd Prydain amongst the enchanters was translated into verse by Davydd ap Gwilym in his poem, 'Cyffelybiad rhwng Morfudd a'r Delyn'. The poem speaks of Iddawc as an Irishman.
   Iddawc was also, with Trystan and Gweirwerydd Vawr, one of the three stubborn ones, whom none could divert from their purpose. He is supposed to have afterwards embraced a religious life, probably when he did penance at Llechlas (possibly Glasgow), in North Britain, as mentioned in the Tale. His name is found in the Catalogue of the Welsh Saints. Professor Rees, however, considers this an error for Iddew ab Cawrda ab Caradawc Vreichvras, arising from the similarity of their names.