Eadmund was the son of King Eadweard the Elder and Eadgifu. He succeeded his half-brother of Æthelstan in late 939. Soon after his accession Eadmund faced a rebellion of the Mercian Danes, which he successfully suppressed. However, in 939/940 he lost Northumbria and the South Danelaw to the Danes. In 940-942 Eadmund's authority was recognized only in the lands south of Watling Street. In 942 Eadmund recovered the South Danelaw, and in 944 he reconquered Northumbria. In 945 Eadmund overran Strathclyde, giving it to Malcolm I, king of Scots, on the condition of military support. Eadmund was murdered by an exiled robber, while trying to rescue one of his officials in a brawl at Pucklechurch. Biography sources: [1][2][3]