“Individualism regards man - every man - as an independent, sovereign entity who possesses an inalienable right to his own life, a right derived from his nature as a rational being. Individualism holds that a civilized society, or any form of association, cooperation or peaceful co-existence among men, can be achieved only on the basis of the recognition of individual rights - and that a group, as such, has no rights other than the individual rights of its members.”
Ayn Rand
Thomas Aquinas is credited as one of the greatest proponents of natural law. During his time in Cologne he was taught by Albertus Magnus. Magnus used the teachings of Aristotle in his mentorship of Thomas Aquinas.