Edmund Ironside was the son of Ethelred 'The Unready' and his first wife, Elfgifu. He made himself ruler in the Danelaw, independent of his father. Canute defeated him at Ashingdon in Essex in the summer of 1016, striking a treaty of peace which allowed Edmund to rule in Wessex and Canute to take the rest. Edmund died in at the end of the year.
Edmund II Ironside's position in the genealogical roll of the Kings of England © The British Library Board, Royal 14 B. VI membrane