Áedán's army included the Bernician exile Hering, son of the former Bernician king Hussa; his participation is mentioned by the Anglo-Saxon Chronicle (manuscript E, year 603), and may indicate dynastic rivalry among the Bernicians.
His brother Máel Umai (died 610) fought at the Battle of Degsastan where he is said to have killed the brother of King Æthelfrith of Bernicia.
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Nevertheless, there is some evidence from the Anglo-Saxon Chronicle that following Hussa's death, there was a schism between his family and that of Æthelfrith, Hussa's successor, for it states that Hering son of Hussa, led Áedán mac Gabráin's forces against Æthelfrith at the Battle of Degsastan in 603.