Historians have accepted that Alberht was a real historical figure who was possibly an heir of Ælfwald. At Ælfwald's death in 749, the kingdom was divided between Alberht and Beonna, who was perhaps a Mercian and who took the lead in issuing regnal coinage and maintaining a military alliance with Æthelbald, king of Mercia. Alberht was ruling in East Anglia when Æthelbald was murdered in 757, after which Beornred ruled for a year in Mercia, before Offa seized power from him. The evidence of Alberht's single discovered coin indicates that he had sufficient authority to issue his own coinage, a degree of independence that was soon eclipsed by the rapid growth of Offa's power in East Anglia.