On this day in 1040 King Duncan I of Scotland was killed in battle by his own men, led by his duke Macbeth. However, there have been claims that Duncan was not murdered. Macbeth, whose full name was Mac Bethad mac Findlaích, then became King. He reigned until his death in 1057 during the English invasion at the hands of Duncan’s son Malcolm. Malcolm became King after assassinating Macbeth’s stepson Lulach who took the throne upon Macbeth’s death. This story is immortalised as the basis for William Shakespeare’s play ‘Macbeth’.