John Ponet (1516–1556) was a central figure in the English Reformation—an intellectual, ecclesiastical leader, and political thinker. This monograph revisits Ponet’s contributions to theology, humanism, and political theory, revealing his vital role in the Edwardian Reformation as a leading member of the Cambridge “Athenians”. Using newly discovered archival material and his reconstructed personal library, this study offers a fresh perspective on Ponet's influence, from his promotion of evangelical reforms under Edward VI to his advocacy for limited monarchy and resistance against tyranny under Mary. By rightly remembering Ponet, this book challenges the prevailing narratives and reshapes our understanding of the early English Reformation and mid-Tudor England.