Almost nothing is known about Edmund. He is thought to have been of East Anglian origin and was first mentioned in an annal of the Anglo-Saxon Chronicle, written some years after his death. The kingdom of East Anglia was devastated by the Vikings, who destroyed any contemporary evidence of his reign. Later writers produced fictitious accounts of his life, asserting that he was born in 841, the son of Æthelweard, an obscure East Anglian king, whom it was said Edmund succeeded when he was 14 (or alternatively that he was the youngest son of a Germanic king named Alcmund). Later versions of Edmund’s life relate that he was crowned on 25 December 855 at Burna (probably Bures St Mary in Suffolk), which at that time functioned as the royal capital,[2] and that he became a model king.

In 869, the Great Heathen Army advanced on East Anglia and killed Edmund. He may have been slain by the Danes in battle, but by tradition he met his death at an unidentified place known as Haegelisdun, after he refused the Danes’ demand that he renounce Christ: the Danes beat him, shot him with arrows and then beheaded him, on the orders of Ivar the Boneless and his brother Ubba. According to one legend, his head was then thrown into the forest, but was found safe by searchers after following the cries of an ethereal wolf that was calling out in Latin, “Hic, Hic, Hic” – “Here, Here, Here”.