Philosopher-Kings and the Ideal City

Plato's Republic imagines an ideal city, called Kallipolis ('beautiful city'), with three classes that mirror the soul: producers such as farmers and craftsmen, auxiliaries who defend the city, and guardians who rule. Plato argued that rulers should be philosophers, because only those who know the Good can govern wisely. Guardians would own no private property and, controversially, would not have private families, so that loyalty to the city would replace private interest.

Plato also proposed that women with the right abilities could be guardians, a striking idea for a society that excluded women from politics. To keep the classes stable, he suggested a 'noble lie' telling citizens they were born with different metals in their souls. Interpretations differ sharply: some see a serious blueprint, others a thought experiment about the soul, and critics such as Karl Popper condemned it as a model for authoritarian rule.