Cadwallar
A historical seventh-century hero, the son of Cadwallon (Catwallaun), King of the Vendotii (Venetii) in Gwynedd.
He defeated and killed Edwin (or Eadwine) of Northumbria in 633 but, approximately one year later, was himself killed in battle.
Cadwallader features in the Armes Prydein, which foretells that he will rise again and lead an army that will drive the Saxons back into the sea.
Welsh tradition makes him a saint who was active in and around Anglesey and Carmarthen.