# Glaucon — The Republic character guide

> Glaucon in The Republic by Plato.

**Role:** major

**First appearance:** 0005-persons-of-the-dialogue

## Snapshot

Restless and competitive, he demands that Socrates defend justice on its own merits rather than on the rewards it happens to bring.

## Who they are

Glaucon is the young Athenian who first urges the group to stay for the torch-race and then pushes the discussion past easy morality. He plays devil's advocate with real relish, laying out the strongest case for injustice so that Socrates must answer it honestly. His challenge transforms the dialogue from a quarrel with a sophist into a serious inquiry into why anyone should be just at all.

## Relationships

### [Socrates](https://www.betterreads.dev/discover/1497/characters/socrates)

_friendship_

Glaucon is Socrates's eager and principal interlocutor, pushing the argument forward with challenging questions and requests for clarification.

### [Adeimantus](https://www.betterreads.dev/discover/1497/characters/adeimantus)

_family_

Adeimantus and Glaucon are brothers, and they work together to present a formidable challenge to Socrates about the nature of justice.

### [Polemarchus](https://www.betterreads.dev/discover/1497/characters/polemarchus)

_social_

They are fellow participants in the dialogue, with Glaucon being a more central figure and Polemarchus the host.

### [Thrasymachus](https://www.betterreads.dev/discover/1497/characters/thrasymachus)

_rivalry_

Their interactions are marked by intellectual disagreement, as Glaucon aligns with Socrates against Thrasymachus's cynical view of justice.

### [Cephalus](https://www.betterreads.dev/discover/1497/characters/cephalus)

_social_

Cephalus is the elderly host to Glaucon, who is a guest and primary participant in the dialogue that follows.

### [Socrates](https://www.betterreads.dev/discover/1497/characters/socrates)

_friendship_

Glaucon is Socrates's eager and principal interlocutor, pushing the argument forward with challenging questions and requests for clarification.

### [Socrates](https://www.betterreads.dev/discover/1497/characters/socrates)

_friendship_

Glaucon is Socrates's eager and principal interlocutor, pushing the argument forward with challenging questions and requests for clarification.

## In the story

### [Book I](https://www.betterreads.dev/discover/1497/chapters/book-i)

Accompanies Socrates to the Piraeus; agrees to stay at Polemarchus's insistence.

### [BOOK II](https://www.betterreads.dev/discover/1497/chapters/book-ii)

Leads the renewed attack on justice, classifying goods and presenting the social contract theory and the myth of Gyges to argue justice is not chosen willingly.

### [Book III](https://www.betterreads.dev/discover/1497/chapters/book-iii)

The primary interlocutor, agreeing with Socrates's proposals and affirming the logical conclusions.

### [BOOK IV](https://www.betterreads.dev/discover/1497/chapters/book-iv)

Present and in agreement, but less active in this specific dialogue segment.

### [BOOK V](https://www.betterreads.dev/discover/1497/chapters/book-v)

Supports Adeimantus's demand, encourages Socrates to speak freely, and laughs at Socrates's fears of causing injury with his argument.

### [BOOK VI](https://www.betterreads.dev/discover/1497/chapters/book-vi)

Primary interlocutor; agrees with Socrates's steps in defining the philosopher's qualities and the need for philosopher-rulers.

### [BOOK VII](https://www.betterreads.dev/discover/1497/chapters/book-vii)

The primary interlocutor; agrees with Socrates's interpretation of the allegory and discusses the practical timeline for educating rulers.

### [BOOK VIII](https://www.betterreads.dev/discover/1497/chapters/book-viii)

Primary interlocutor; agrees with Socrates's plan and prompts the discussion of the four governments.

### [BOOK IX](https://www.betterreads.dev/discover/1497/chapters/book-ix)

The primary respondent, agreeing with Socrates's points about the nature of appetites and the generation of the tyrannical man.

### [Book X](https://www.betterreads.dev/discover/1497/chapters/book-x)

The primary interlocutor, answering Socrates' questions and following the logical progression about imitation and the soul.

## Links

- HTML: https://www.betterreads.dev/discover/1497/characters/glaucon
- Book: https://www.betterreads.dev/discover/1497
- All characters: https://www.betterreads.dev/discover/1497/characters