Political anarchism is a philosophy which rejects the legitimacy of political authority and adherence to any form of sovereign rule or autonomy of a nation-state. An argument for political anarchy is made by Michael Huemer in his book "The Problem of Political Authority". On the other side, one of the main arguments for the legitimacy of the state is some form of the social contract theory developed by Thomas Hobbes in his 1668 book, "Leviathan", or by Jean-Jacques Rousseau in his political writings on the social contract.