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In page James Heath (historian):

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Heath was the first biographer of Oliver Cromwell, earning himself the name “Carrion” Heath for his Flagellum (1663).[5] John Morrill, in a 2003 article Rewriting Cromwell: a case of deafening silences, describes it as "scurrilous, mendacious, malicious"; but he commends the historical value of some additions made by an anonymous editor to the third edition, prepared after Heath's death.[6]