 Historians disagree as to whether Ælfwald was replaced by Eardwulf, who would thus have reigned a second time from 808 to 811 or 812, or whether the reign of Eardwulf's son Eanred began in 808.Recent studies, based on the discovery of a penny of Eanred for which a date no earlier than c. 850 is proposed, suggest a very different dating for ninth-century Northumbrian kings.From this, it is argued that Eardwulf's second reign ended circa 830, rather than in the years soon after 810, and that the reigns of subsequent kings should be re-dated accordingly