Aethelfirth (Aethelfrith in the Definitive Edition) is an infantry hero available in the Scenario Editor in Age of Empires II based on a Bernician King named Æthelfrith who ruled over present day Scotland. Æthelfrith was especially notable for his victories against the Britons and the Gaels. As a hero, Aethelfirth cannot be converted and regenerates health (since The Conquerors).

Aethelfirth is represented by a Woad Raider but with better stats. Like other infantry units, Aethelfirth is affected by all upgrades that affect infantry as well as any other bonuses that affect them.

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