Professor Hinsley's book, first published in 1966, offers a general survey of the history of the theory of sovereignty, which seeks to illuminate the theory's character and function by stressing the changing social, political and economic frameworks within and between the political societies in which it has developed. It also spans and connects the different intellectual aspects of the concept of sovereignty: philosophical, legal, historical and political. For this new edition Professor Hinsley has wholly rewritten the last chapter to bring the history up to date, and to make some new concluding remarks.