Æthelfrith

Bernician king

Æthelfrith was King of Bernicia from c. 593 until his death around 616 AD at the Battle of the River Idle. He became the first Bernician king to also rule the neighboring land of Deira, giving him an important place in the development and the unification of the later kingdom of Northumbria. He was especially notable for his successes against the Britons and his victory over the Gaels of Dál Riata. Although he was defeated and killed in battle and replaced by a dynastic rival, his line was eventually restored to power in the 630s.

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