# Theodorus — Dialogues character guide

> Theodorus in Dialogues by Plato.

**Role:** supporting

**Also known as:** Theodorus the geometrician, Theodorus the Samian, Theodorus Disciples

**First appearance:** 0084-theaetetus

## Snapshot

A Cyrenean geometer whose quiet authority draws Socrates and a visiting Eleatic stranger into the hardest questions of the day.

## Who they are

Theodorus is the host and catalyst of the late dialogues, a mathematician from Cyrene whose conversation with Socrates sets the stage for the Eleatic Stranger's interrogation of the Sophist. He is deferential but firm, willing to yield the floor yet insistent that the matter at hand deserves a proper answer. His role is to bridge the worlds of Socratic inquiry and Eleatic method, making him the hinge on which the dialogue's early momentum turns.

## In the story

### [Theaetetus](https://www.betterreads.dev/discover/dialogues_se/chapters/theaetetus)

The geometrician who introduces Theaetetus to Socrates and participates in the early discussion.

### [Introduction and Analysis](https://www.betterreads.dev/discover/dialogues_se/chapters/introduction-and-analysis)

Interlocutor who engages with Socrates, expresses enjoyment of digressions, and is drawn into the debate about the flux doctrine.

### [Theaetetus](https://www.betterreads.dev/discover/dialogues_se/chapters/theaetetus)

Mentioned as having been present earlier in the discussion, though not directly participating in this excerpt.

### [Sophist](https://www.betterreads.dev/discover/dialogues_se/chapters/sophist)

Present as a companion, though not actively participating in the main discussion.

### [Sophist](https://www.betterreads.dev/discover/dialogues_se/chapters/sophist)

Brings the Eleatic Stranger to the discussion and vouches for his philosophical nature.

## Links

- HTML: https://www.betterreads.dev/discover/dialogues_se/characters/theodorus
- Book: https://www.betterreads.dev/discover/dialogues_se
- All characters: https://www.betterreads.dev/discover/dialogues_se/characters