Edward was born around 962 to King Edgar the Peaceful and Queen Æthelflæd Eneda — the great-great-grandson of Alfred the Great. On his father Edgar's death in 975, the succession was contested between Edward (eldest son, age 13) and the younger Æthelred (son of Edgar's second wife Queen Ælfthryth, age 9).
The succession dispute divided the English Catholic episcopate: Archbishop Dunstan of Canterbury, Oswald of Worcester, and the reformist Benedictine party supported Edward; the anti-reform party of secular clergy and the queen-mother Ælfthryth supported Æthelred. Edward was crowned at Kingston upon Thames in summer 975 by Dunstan — the reformist Benedictine settlement.
On the evening of March 18, 978, the 15-year-old (per some sources 16-year-old) King Edward rode to the royal residence of his stepmother Queen Ælfthryth and his stepbrother Æthelred at Corfe Castle in Dorset. Refused entry into the hall, he was given a cup of mead at the saddle by retainers of his stepmother — and as he drank, was stabbed in the back and fell from the saddle, his foot caught in the stirrup; the horse dragged the dying boy across the ground before he was killed.
His body was hastily buried at Wareham; in 980, after the reports of miracles at the tomb, Archbishop Dunstan and Ealdorman Ælfhere translated the relics to Shaftesbury Abbey in Dorset (the Benedictine women's abbey founded by King Alfred). The shrine at Shaftesbury became one of the principal pilgrim destinations of medieval England.
In 1001, at the request of his stepbrother King Æthelred (now reigning as Æthelred the Unready, who repented of the murder of his older brother), Pope John XVII canonized Edward as martyr — the martyr-king tradition of the late-Anglo-Saxon Catholic English kingdom.

