Why are natural rights considered “enlightened”idea?

A way easier way to answer this is that during the enlightenment era, many people came up with new ideas about society, it was also a time of happiness. So, natural rights are considered this because they are rights you are born with and cannot be taken away from you, under any circumstances. People came up with this idea of rights because they thought it would make society a lot better.

Ibelieve appendix i maybe wrong