A devout puritan, Henry Ireton was an immediate parliamentarian activist rising to the rank of Commissary-General of the New Model Army. Ireton shared Oliver Cromwell's religious enthusiasm and acted as one of his political mentors. Ireton, more than any other individual, even Cromwell, brought about the execution of Charles I. Indeed it was Ireton's influence, symbolised by his marriage to Bridget Cromwell, that did much to persuade Cromwell to become...