Unlike later kings of Gwynedd, usually resident at Aberffraw in western Anglesey, Cynan maintained his court at Llanfaes on the southeastern coast.
[1] Cynan's reign was marked by a destructive dynastic power struggle with a rival named Hywel ap Caradog, usually supposed to be his brother.
There is no historical record of Cynan's early years as king, but his reign ended in a combination of natural disasters and military reverses.
[3] (In comparison, it takes care to point out the brotherly nature of Elisedd's slaughter of Gruffydd ap Cyngen in Powys around the same time.)
[note 1] Cynan's daughter Esyllt became the mother of Merfyn Frych ap Gwriad, the first King of Gwynedd (c. 825 – c. 844) known not to have descended from the male line of Cunedda and father of Rhodri Mawr.