James Harrington (1611-1677) was a pioneer in applying the methods of Machiavelli and other civic humanists to English political society and its landed structure. In the century after his death, his ideas were adapted to become an important ingredient in the vocabulary of both English and American political opposition to the methods of Hanoverian parliamentary monarchy. This work includes all of his prose works on political subjects as well as Oceana, his best-known work. The critical introduction attempts to revalue the evidence concerning Harrington's life and writings, to locate them in the context of Civil War, Commonwealth and Puritan thinking and to trace the development of Harringtonian and neo-Harringtonian ideology during subsequent generations.