Treason of the Long Knives

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The Treason of the Long Knives^[1] (Welsh: Brad y Cyllyll Hirion) is an account of a massacre of British Celtic chieftains by Anglo-Saxon soldiers at a peace conference on Salisbury Plain in the 5th century. The story is thought to be pseudohistorical as the only surviving records mentioning it are centuries later in the semi-mythological histories of the Historia Brittonum and the Historia Regum Britanniae. Though a popular cautionary tale in medieval Europe, there is no other historical evidence for The Treason of the Long Knives. Most historians interpret the story as a purely literary construction.^[2]