Eidyn was a district of the Gododdin kingdom in the Hen Ogledd, or "Old North", the Brittonic-speaking parts of Northern England and southern Scotland in the Early Middle Ages.
They proceeded to raid and burn Arfon until Rhun ap Maelgwn and the armies of Gwynedd forced them out.
[3] Clydno's name also appears in lists of the Thirteen Treasures of the Island of Britain.
The explanatory note attached to later versions of the lists explain the halter's property: when he affixed it to a staple at the foot of his bed, he would find whatever horse he wished in it.
Later works mention Cynon's great love for Morvydd, daughter of Urien Rheged, and he appears in the prose tale Owain, or the Lady of the Fountain, taking the role given to Calogrenant in other versions of the story.