[1] In Lifris' Life of St Cadog, abbot of Llancarfan (written c. 1100), Cynan Garwyn intends to undertake a raid against Glamorgan, whose king is so terrified that he asks the clergy of the saint's house to intercede for him.
The tree bends in such a way that it forms a bridge to the opposite bank of the river and having so witnessed the saint's miraculous powers, Cynan is dissuaded from his violent plans and proclaims peace on all the land.
[3] Cynan is here described as a king of Rheinwg, which may be a geographical territory named after Rhain ap Cadwgan in Dyfed, in/near Brycheiniog, or on the border between modern-day Herefordshire and Brecknockshire,[1] most likely in one or both of the former two.
In the Welsh life of St Beuno, Cynan is credited for granting land at Gwyddelwern (in Edeirnion) to the saint.
[citation needed] It is sometimes argued that he died with his son at the Battle of Chester in around 613 but any precise description would be based more on the desire to create a myth of the foundation of a dynasty or legend of Powysian glory than on available evidence.