This chapter examines the earliest natural rights theories in order to analyse philosophical connections between natural and human rights, concerning: scepticism, metaphysical dualism, and the authority of rights. First, the chapter studies Albert the Great’s principles of right and how he understood nature to be reason. Next, analysis of the main tenets of Henry of Ghent’s metaphysics, and his exposition of the soul’s property over one’s body, show that Neoplatonist dualism was fundamental in the development of the first natural rights theories. The philosophical solution to the poverty controversy, of human beings’ natural rights to use material goods, that Hervaeus Natalis proposed became the law of the Church when the Pope incorporate it in the bull, Cum inter nonnullos (1323). Hervaeus continued the metaphysical dualism of Henry and argued that natural rights endowed reality with normativity and hence authority. The chapter concludes by relating this intellectual history to contemporary rights theories. Natural and human rights are identified as a form of public reason that sometimes assists, other times substitutes for, individual right reason and judgement about morality.