800. Eardwulf of Northumbria orders the killing of Alhmund, son of King Alhred
Simeon of Durham notes that Alhmund, the son of King Alhred (765-74), was seized by the guards of King Eardwulf, and killed along with his fellow fugitives. It is not clear where Alhmund had fled to; in 801 Eardwulf would pursue more fugitives into Coenwulf's Mercia. It was perhaps as a result of the battles of 801 that a cult of St Alhmund was encouraged at Derby where his body rested: Coenwulf may have used the cult to emphasize the guilt of Alhmund's murderer and so encourage dissatisfaction with Eardwulf (see Rollason, p.20). If Wada had fled to Coenwulf immediately after the battle of 798, the Mercian / Northumbrian antipathy might have begun a few years earlier.
D. Rollason, "The cults of murdered royal saints in Anglo-Saxon England", Anglo-Saxon England 11 (1982), pp.1-22