Aed mac Eochaid (845-) was a Pictish adventurer and mercenary who lived in Northumbria during the 9th century. Aed was the son of a merchant, and he became a traveller by profession. In 868, he pledged his allegiance to the Danish lords of Northumbria, and he slew the criminal Dyfrig of Din Draithou at Denises Ham on the orders of Hersir Fraena. He travelled across southern Scotland, being captured several times by enemies such as Norwegian Viking brigands, the Picts of Alba, the Britons of Strat Clut, and other criminals. Aed even visited Hadrian's Wall and found a Romano-British refugee camp there, but his adventuring days became numbered as his frequent captures in battle, Jarl Halfdan Whiteshirt's refusal to accept an oath of allegiance from him, the demoralization and desertion of his men, and his dwindling finances limited his options. He converted to paganism with the goal of pillaging the monastery of Abernethy, but he lacked the manpower to attack it, and he ultimately decided to return to a life of poverty, ending his adventuring days.