Thomas Hobbes, the royalist, is above all famous for his social contract theory, the appeal to the agreement that would be made among rational, free, and equal persons. His conclusion that we should submit to the authority of an absolute and unlimited sovereign power may not have found many followers, but his analysis remains unchallenged.
John Locke, by contrast, was a parliamentarian. He argued that sovereignty resides with the people, that the state is supreme only when bound by civil and natural law. It follows that revolution is not only a right, but sometimes an obligation. He was a strong supporter of religious freedom, and of a system of checks and balances in government. Many of his ideas were later embodied in the US Constitution.
