How did Plato’s Republic describe selective breeding in human society?

In his work The Republic, Plato describes a society that utilizes selective breeding as a means to improve the human population. While modern eugenics emerged in the late 19th century, Plato’s ancient philosophical framework proposed that the state should actively manage reproduction to foster desirable traits among its citizens.1

It is important to recognize that such proposals, which prioritize state control over individual reproductive autonomy, are fundamentally incompatible with modern ethical principles regarding human rights, bodily integrity, and the inherent dignity of every individual. The use of state power to dictate human reproduction is a coercive practice that disregards the value of human diversity and personal freedom.

Plato’s vision in The Republic reflects his broader political philosophy, which sought to impose order and harmony through the rule of an elite class, often at the expense of individual liberty. By advocating for the regulation of human biology to serve the perceived needs of the state, his work serves as an early, albeit primitive, precursor to later ideologies that sought to apply "scientific" management to human society.21