The Battle of Argoed Llwyfain was fought between the forces of the Kingdom of Rheged under the command of Urien and Owain mab Urien and the forces of the Kingdom of Bernicia under Fflamddwyn (Firestealer or Flamebearer).[1]
Most of what is known about the battle comes from the early Welsh poem Gwaith Argoed Llwyfain by the poet and bard Taliesin.[1] Supposedly on one Saturday, Fflamddwyn had surrounded the seat of power within Rheged and demanded that KingUrien submit and provide hostages. Urien's son Owain and his friend Cenau rejected this proposal. Urien then stirred his men and fighting began. In the ensuing combat Fflamddwyn was slain, temporarily freeing Rheged of the Anglian menace.[2][3]