Popular interest in Cromwell has often exceeded the originality of what has been written about him. Barclay's study comes out of meticulous research on a huge range of newly discovered primary sources, transforming our understanding of the life and career of Oliver Cromwell during the period from his birth in 1599 until 1642.

Popular interest in Cromwell has often exceeded the originality of what has been written about him. Barclay's study comes out of meticulous research on a huge range of newly discovered primary sources, transforming our understanding of the life and career of Oliver Cromwell during the period from his birth in 1599 until 1642.