Edward the Martyr was King of England from 975 until he was murdered in 978. Edward was the eldest son of King Edgar the Peaceful but was not his fathers acknowledged heir. On Edgars death, the leadership of England was contested, with some supporting Edwards claim to be king and others supporting his much younger halfbrother thelred the Unready, recognized as a legitimate son of Edgar. Edward was chosen as king and was crowned by his main clerical supporters, the archbishops Dunstan and Oswald of Worcester.
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Source: Wikipedia