... "It is manifest there came not to Gododin, in behalf of the Britons, a hero from a distant region, who was better than Cynon (the Prince)."  Taking Cynon (the Prince) to apply to Eidiol, it is clear that this passage very aptly describes Ambrosius Aurelianus, whose usual residence was Brittany.  (4) The very peculiar name for a Roman, Ambrosius, equivalent to the Cymric Emrys, gives us great reason to place faith in the conjecture of Mr. Davies, viz., that Aurelianus gained the cognomen of "Ambrosius," or "Emrys" from his successful defence of the Cor, or Gwaith, Emrys, i.e., Stonehenge.  Mr. Davies thus puts it.  "The very same actions are ascribed to Eidiol and Emrys (Ambrosius), such as burying the British nobles, erecting their monument at Ambresbury, taking Hengist prisoner at Caer Gynan, or Conisborough, and causing him to be beheaded.  If this Eidiol was not Ambrosius, we must consider him as the great agent and counsellor of that prince, to whom his actions were consequently ascribed."... (Stonehenge, Viewed by the Light of Ancient History and Modern Observation, Gidley, 1877).