Who a book called the republic about the ideal government?

"The Republic" is a philosophical work by the ancient Greek philosopher Plato, written around 380 BCE. In this dialogue, Plato explores the concept of justice and the ideal state, proposing a society governed by philosopher-kings who possess wisdom and virtue. He outlines a structured society divided into three classes: rulers, warriors, and producers, each fulfilling their roles for the harmony of the state. The work also delves into the nature of reality and knowledge, exemplified by the Allegory of the Cave.