It appears that after Æthelstan's death, not only did Edmund lose control of Northumbria, but that the Five Burghs of the Mercian Danelaw also pledged themselves to Amlaíb mac Gofrith.
Parece ser que, tras a morte do rei saxón, Edmund non só perdeu o control de Northumbria, senón tamén que os cinco burgos de Danelaw se someteron ao mando de Amlaib mac Gofrith.