From @joannechocolat
Aesara of Lucania (Greek, 4th or 3rd century BC) was a Pythagorean philosopher, who wrote a work entitled "On Human Nature", of which a fragment is preserved by Stobaeus.
Aesara argues that it is by studying our own human nature (and specifically the human soul) that we can understand the philosophical basis for natural law and morality.
She divides the soul into three parts: the mind, which performs judgment and thought, the spirit, which contains courage and strength, and desire, which provides love and friendliness.
These things, being divine, are the rational, mathematical, and functional principles at work in the soul. Aesara's theory of natural law concerns three applications of morality, concerning the individual, the family, and social institutions.
The Pythagoreans were notable for including women in their ranks. This did not necessarily equate to modern ideas of equality; they believed that women were responsible for creating harmony and justice in the home, and that men had the same responsibility towards the state.
Seen in this context, Aesara's theory of natural law is fundamental to justice and harmony in society as a whole.