dmund I, son of Edward the Elder, became King of England from October 939 at the age of eighteen after the death of his half brother Aethelstan. He inherited a peaceful nation but because of his age the enemies that his brother had kept under control thought they could unseat the young king. One of these was the Viking Olaf Guthfrithson who had been defeated at the Battle of Brunanburh and who had fled to Ireland. He returned to England and invaded Northumberland taking the city of York. Edmund took an army north but after a brief battle neither side had gained any advantage. The Archbishops of Canterbury and York negotiated a peace treaty that effectively divided the country in two leaving Edmund ruling the south and Olaf ruling the north. But the peace with the Vikings in the north was short-lived when they attempted to invade lands in the Midlands. In response and with the assistance of the Scots, Edmund defeated the Vikings. To ensure the peace was kept in the north, Edmund entrusted the land to Malcolm I, the Scottish king on the condition that Malcolm would do homage to him and attend importand festivals at the English Court. Edmund was murdered at Pucklechurch (Pucklekirk) in Gloucestershire by a criminal called Leoff while attending a feast. When Edmund attempted to remove Leoff from the feast, the criminal produced a dagger and stabbed the King. Edmund married Aelfgifu (and Ethelflaed) and had two sons Eadwig and Edgar. His sons were too young to rule when their father died and so Eadred, Edmund's brother became the next King of England.

 Edmund (I, King of the English 939-946) (b.922? - d.946)
    +Aelfgifu ( - d.944?)
        = Eadwig (King of the English 955-959) (b.939 - d.959)
        = Edgar (I, King of the English 959-975) (b.944 - d.975)
            +Ethelflead
            |   = EDWARD (The Martyr, King of the English 975-978) (b.962 - m.978)
            +Wulfryth
            +Elfthyrth (b.945 - d.1000)
                = Edmund (b.965 - )
                = Aethelred (II The Unready, King of the English 978-1013, 1014-1016) (b.967 - d.1016)
                    +Aelfgifu
                    |   = Aethelstan (son of Aethelred)
                    |   = Egbert
                    |   = Edmund (II Ironside, King of the English 1016) (b.981 - d.1016)
                    |   = Eadred
                    |   = Eadwig
                    |   = Edgar
                    +Emma (of Normandy, Wife of Aethelred) (b.982? - d.1052)
                        = Edward (The Confessor, King of England 1042-1066) (b.1003? - d.1066?)
                        = Alfred (Aetheling) (b.1005? - m.1036)
                        = Godgifu (Daughter of Aethelred)