The origins of human rights really must start with a history of moral philosophy, when it became possible for certain thinkers in the Western tradition to say that everywhere and always individuals in virtue of their humanity have some set of basic entitlements. Historians have argued a lot when exactly the moment was that any philosopher said such a thing, long before the idea of human rights became politically explosive or emancipatory. My own view is that the early modern period as historians call it, which is roughly the period in between the Renaissance and Reformation and the American and French revolutions, so the 1500s to the 1800s, is really pivotal, mainly because that’s the point at which you get a new kind of state.
Probably the first natural rights thinker who says in a book that individuals have inalienable rights is Thomas Hobbes, an Englishman, and his goal is actually to make the state more powerful. For Hobbes, there’s a state of nature and individuals have rights in it, at least the right to try to remain alive in conditions of anarchy and war. The individual and those dire straits can give away most of that right to a Leviathan state that will hopefully provide protection. The inalienable part for Hobbes is that the sovereign can never take away your right to flee from his authority if push comes to shove.
What we can say historically is that there’s a very interesting analogy that such figures, Hobbes and his great successor John Locke, draw in saying that individuals in this state of nature are like the new states of the post-Renaissance era in their own international relations. Maybe the whole idea of the individual with rights that he has in virtue of his humanity is based on the appearance of this new, very powerful state. Even then, the idea of natural rights didn’t have a big impact on political life for two reasons. One is simply that it was so threadbare. Hobbes gives you a right to life and the right to run from the sovereign. Locke gives you a little bit more: the right to private property before the state. Otherwise, we’re awaiting a time when individuals in the 18th century leading up to the American and French revolutions take this idea of rights and make it politically explosive. So, the second major development is that they move the notion of human rights from moral philosophy into the central political forum of their times, which is whether their state should survive in the same way.