Disambiguation evidence for Æthelfrith of Northumbria via surface form

"Æthelfrith of Bernicia (overlord)"

Triples (1)

Triples where some other subject referred to this entity as "Æthelfrith of Bernicia (overlord)".

Kingdom of Deira notableRuler
"Æthelfrith of Bernicia (overlord)"
↳ resolves to Æthelfrith of Northumbria