Glaucon (; ; c. 445 BC – 4th century BC), son of Ariston, was an ancient Athenian and Plato's older brother. He is primarily known as a major conversant with Socrates in the Republic.
Glaucon (; ; c. 445 BC – 4th century BC), son of Ariston, was an ancient Athenian and Plato's elder sibling. He is mainly recognized for his extensive dialogue with Socrates in the Republic.