This wide-ranging and original study provides an insight into the climate of political thought during the lifespan of what was, at this time, the most powerful empire in history. A distinguished group of contributors explores the way in which thinkers in Britain theorised influential views about empire and international relations, exploring topics such as the evolution of international law; the ways in which the world was notionally divided into the 'civilised' and the 'barbarian'; the role of India in shaping visions of civil society; grandiose ideas about a global imperial state; the development of an array of radical critiques of empire; the varieties of liberal imperialism; and the rise and fall of free trade. Together, the chapters form an analysis of political thought in this context; both of the famous (Bentham, Mill, Marx, and Hobson) and of those who, whilst influential at the time, are all but forgotten today.