Oliver Cromwell - the only commoner to have become Britain's head of state - has puzzled biographers for centuries. He was a complex character, courageous but at the same time devious and self-serving. But the Cromwell who comes through in his own speeches and writings does not give us the full picture.

In this edition of Not Just the Tudors, Professor Suzannah Lipscomb talks to Professor Ronald Hutton about his remarkable new book which reveals a Cromwell who was both genuine in his faith and deliberate in his dishonesty.

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