In this concise and accessible biography, Martyn Bennett examines the life of Oliver Cromwell - one of the most controversial figures in world history. This study challenges long-held perceptions of Cromwell and the Commonwealth, arguing that they need to be placed at the core of early Modern British and Irish history. Charting his early career, the origins of his political and religious thought, and the development of his notions of governance that influenced him as Lord Protector, Martyn Bennett contests the post-Restoration vilification of Cromwell to examine how his influence has shaped notions of citizenship, identity and governance and informed the relationship between religion and the state in Britain. This radical interpretation will give students a clearer view of the motivations and achievements of a fascinating and pivotal figure in British history.