article: Athelfrith of Bernicia
links: Northumbria Angles Bernicia Bede Edinburgh Anglo-Saxon Ida of Bernicia Pennines Chester Ecgfrith of Northumbria Deira Powys Picts Dál Riata Mercia Doncaster Argyll Oswiu of Northumbria Britons (Celtic people) Scottish people Alle Catterick East Anglia River Humber Oswald of Northumbria