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Natural rights and legal rights are the two basic types of rights. Natural law first appeared in ancient Greek philosophy, and was referred to by Roman philosopher Cicero. It was subsequently alluded to in the Bible, and then developed in the Middle Ages by Catholic philosophers such as Albert the Great and his pupil Thomas Aquinas. During the Age of Enlightenment, the concept of natural laws was used to challenge the divine right of kings, and became an alternative justification for the establishment of a social contract, positive law, and government – and thus legal rights – in the form of classical republicanism. Conversely, the concept of natural rights is used by others to challenge the legitimacy of all such establishments. The idea of human rights is also closely related to that of natural rights: some acknowledge no difference between the two, regarding them as synonymous, while others choose to keep the terms separate to eliminate association with some features traditionall

The idea that certain rights are natural or inalienable also has a history dating back at least to the Stoics of late Antiquity, through Catholic law of the early Middle Ages, and descending through the Protestant Reformation and the Age of Enlightenment to today. The existence of natural rights has been asserted by different individuals on different premises, such as a priori philosophical reasoning or religious principles. For example, Immanuel Kant claimed to derive natural rights through reason alone. The United States Declaration of Independence, meanwhile, is based upon the "self-evident" truth that "all men are … endowed by their Creator with certain unalienable Rights". Likewise, different philosophers and statesmen have designed different lists of what they believe to be natural rights; almost all include the right to life and liberty as the two highest priorities. H. L. A. Hart argued that if there are any rights at all, there must be the right to liberty