---
title: "Centurion — AP Latin Definition & Exam Guide"
description: "Centurion (centurio): the veteran Roman officer who led a century of ~80 men. Know the word, its forms, and how Caesar uses centurions in AP Latin readings."
canonical: "https://fiveable.me/ap-latin/key-terms/centurion"
type: "key-term"
subject: "AP Latin"
unit: "Unit 1"
---

# Centurion — AP Latin Definition & Exam Guide

## Definition

A centurion (Latin centurio, centurionis, m.) was a career Roman officer who commanded a century, a unit of roughly 80 soldiers within a legion. On AP Latin, you need to recognize the word in all its case forms and understand the rank when it appears in Caesar's battle narratives and sight prose.

## What It Is

A centurion was the backbone officer of the Roman army. He commanded a *centuria*, a unit of about 80 men (despite the name suggesting 100, from *centum*), and a legion contained dozens of them. Centurions were promoted from the ranks for bravery and discipline, which is exactly why Latin authors love them. When a writer wants to show raw Roman [courage](/ap-latin/unit-5 "fv-autolink"), a centurion is usually the one charging first or dying last.

For [AP Latin](/ap-latin "fv-autolink"), the word itself matters as much as the history. *Centurio* is a third-declension masculine noun (*centurio, centurionis*), so you'll meet it as *centurionem*, *centurioni*, *centurionum*, and so on. The word formation is a gift for sight reading. You can see *centum* (hundred) inside it, the same root-spotting skill the CED expects you to use on unfamiliar vocabulary. [Caesar](/ap-latin/key-terms/caesar "fv-autolink")'s *De Bello Gallico* features centurions constantly, most famously the rival centurions Pullo and Vorenus, whose competition for glory becomes a mini-drama inside the battle narrative.

## Why It Matters

Centurion lives in [Unit 1](/ap-latin/unit-1 "fv-autolink")'s suggested Latin prose practice and connects to Topic 1.23 (Vergil [Aeneid](/ap-latin/key-terms/aeneid "fv-autolink") War Scenes), where military vocabulary carries the action. It directly supports learning objective AP Latin 1.23.A (define Latin words and phrases), since military terms like *centurio* sit in the core vocabulary you're expected to know cold. It also feeds 1.23.B, because the *centum* root and the *-io, -ionis* noun pattern are exactly the word-formation clues the CED tells you to lean on for unfamiliar words. And under 1.23.C, the case ending of *centurio* in a sentence tells you whether the centurion is doing the fighting (nominative) or getting orders, wounds, or praise (accusative, dative, genitive). Battle scenes move fast in Latin, so knowing the rank vocabulary instantly frees up brainpower for the actual grammar.

## Connections

### [legio (Unit 1)](/ap-latin/key-terms/legio)

The legion is the big picture and the centurion is the moving part. A legion held thousands of soldiers organized into centuries, each led by one centurion. When Caesar narrates a battle, he zooms between legion-level strategy and centurion-level heroism, and you need both words to follow the camera.

### [castra (Unit 1)](/ap-latin/key-terms/castra)

Centurions show up most dramatically when the *castra* (camp) is under attack. Defending or losing the camp is a stock crisis in Caesar's [narrative](/ap-latin/unit-4 "fv-autolink"), and centurions are the ones rallying troops at the rampart. The two words travel together in sight-reading passages.

### Turnus and Aeneid war scenes (Unit 1, Topic 1.23)

[Vergil](/ap-latin/unit-3 "fv-autolink")'s epic warfare doesn't use the rank 'centurion' the way Caesar's prose does, but the same warrior-courage ideal drives both. Comparing how a historical centurion fights for *virtus* and how an epic hero like Turnus fights for glory is exactly the prose-versus-poetry contrast AP Latin is built around.

## On the AP Exam

No released FRQ hinges on the word 'centurion' by itself, but military vocabulary is everywhere in the Caesar half of the course and in sight-reading passages. Expect to translate forms like *centurionem* or *centurionibus* accurately, which means recognizing the third-declension stem *centurion-* and reading the case ending for function. Multiple-choice questions on prose passages often ask who is performing an action or receiving it, and that answer frequently turns on whether *centurio* is nominative or oblique. In essay and short-answer work on Caesar, knowing that centurions are mid-level officers famous for courage helps you explain why Caesar singles them out, since praising centurions is one of his go-to moves for celebrating Roman *virtus*.

## centurion vs legatus (legate)

Both are Roman officers, but they sit at very different levels. A legatus is a senior commander, often in charge of an entire legion and drawn from the elite. A centurio commands a single century of about 80 men and usually rose up from the ranks. Rough modern analogy: the legate is the general's deputy, the centurion is the tough veteran sergeant-captain on the front line. Mixing them up in a translation flattens Caesar's careful picture of the army's chain of command.

## Key Takeaways

- A centurion commanded a century of roughly 80 men, not 100, even though the word comes from centum (hundred).
- Centurio is a third-declension masculine noun (centurio, centurionis), so you must recognize forms like centurionem and centurionibus and use the case ending to find the noun's function, per learning objective AP Latin 1.23.C.
- The centum root inside centurio is a model example of the word-formation strategy the CED recommends for decoding unfamiliar vocabulary (AP Latin 1.23.B).
- Caesar uses centurions as symbols of Roman courage, most famously the rival centurions Pullo and Vorenus, so spotting the rank helps you read his battle narratives correctly.
- Don't confuse a centurion with a legate; the legate is a senior commander near the top of the army, while the centurion is the veteran officer leading troops on the front line.

## FAQs

### What is a centurion in AP Latin?

A centurion (centurio, centurionis, m.) is a Roman officer who commanded a century, a unit of about 80 soldiers within a legion. The word appears throughout Caesar's De Bello Gallico and in prose sight-reading passages, so you need to recognize all its [case](/ap-latin/key-terms/case "fv-autolink") forms.

### Did a centurion command 100 men?

No, not in Caesar's era. Despite the centum (hundred) root in the name, a century typically held about 80 men. The name is a leftover from earlier Roman organization, but the root is still useful for remembering what the word means.

### How is a centurion different from a legate?

A legate (legatus) was a senior commander who could lead an entire legion, while a centurion led just one century of about 80 men. Centurions were usually promoted from the ranks for bravery, which is why Caesar uses them to showcase Roman virtus.

### What declension is centurio?

Centurio is a third-declension masculine noun with the genitive centurionis, so its stem is centurion-. That means forms like centurionem (accusative singular) and centurionum (genitive plural), and the case ending tells you the centurion's function in the sentence.

### Where do centurions show up in the AP Latin readings?

Mostly in Caesar's De Bello Gallico, where centurions drive key battle moments, including the famous rivalry between the centurions Pullo and Vorenus in Book 5. The rank also gives useful background for the warfare and courage themes you analyze in the Aeneid's war scenes (Topic 1.23).

## Related Study Guides

- [1.23 Vergil Aeneid War Scenes Study Guide](/ap-latin/unit-1/vergil-aeneid-war-scenes-study-guide/study-guide/f559d0abcd049fc3)

## Structured Data

```json
{"@context":"https://schema.org","@graph":[{"@type":"LearningResource","@id":"https://fiveable.me/ap-latin/key-terms/centurion#resource","name":"Centurion — AP Latin Definition & Exam Guide","url":"https://fiveable.me/ap-latin/key-terms/centurion","learningResourceType":"Concept explainer","educationalLevel":"AP® / High School","about":{"@id":"https://fiveable.me/ap-latin/key-terms/centurion#term"},"audience":{"@type":"EducationalAudience","educationalRole":"student"},"dateModified":"2026-06-12T03:46:53.513Z","isPartOf":{"@type":"Collection","name":"AP Latin Key Terms","url":"https://fiveable.me/ap-latin/key-terms"},"publisher":{"@type":"Organization","name":"Fiveable","url":"https://fiveable.me"}},{"@type":"DefinedTerm","@id":"https://fiveable.me/ap-latin/key-terms/centurion#term","name":"centurion","description":"A centurion (Latin centurio, centurionis, m.) was a career Roman officer who commanded a century, a unit of roughly 80 soldiers within a legion. On AP Latin, you need to recognize the word in all its case forms and understand the rank when it appears in Caesar's battle narratives and sight prose.","url":"https://fiveable.me/ap-latin/key-terms/centurion","inDefinedTermSet":{"@type":"DefinedTermSet","name":"AP Latin Key Terms","url":"https://fiveable.me/ap-latin/key-terms"}},{"@type":"FAQPage","mainEntity":[{"@type":"Question","name":"What is a centurion in AP Latin?","acceptedAnswer":{"@type":"Answer","text":"A centurion (centurio, centurionis, m.) is a Roman officer who commanded a century, a unit of about 80 soldiers within a legion. The word appears throughout Caesar's De Bello Gallico and in prose sight-reading passages, so you need to recognize all its [case](/ap-latin/key-terms/case \"fv-autolink\") forms."}},{"@type":"Question","name":"Did a centurion command 100 men?","acceptedAnswer":{"@type":"Answer","text":"No, not in Caesar's era. Despite the centum (hundred) root in the name, a century typically held about 80 men. The name is a leftover from earlier Roman organization, but the root is still useful for remembering what the word means."}},{"@type":"Question","name":"How is a centurion different from a legate?","acceptedAnswer":{"@type":"Answer","text":"A legate (legatus) was a senior commander who could lead an entire legion, while a centurion led just one century of about 80 men. Centurions were usually promoted from the ranks for bravery, which is why Caesar uses them to showcase Roman virtus."}},{"@type":"Question","name":"What declension is centurio?","acceptedAnswer":{"@type":"Answer","text":"Centurio is a third-declension masculine noun with the genitive centurionis, so its stem is centurion-. That means forms like centurionem (accusative singular) and centurionum (genitive plural), and the case ending tells you the centurion's function in the sentence."}},{"@type":"Question","name":"Where do centurions show up in the AP Latin readings?","acceptedAnswer":{"@type":"Answer","text":"Mostly in Caesar's De Bello Gallico, where centurions drive key battle moments, including the famous rivalry between the centurions Pullo and Vorenus in Book 5. The rank also gives useful background for the warfare and courage themes you analyze in the Aeneid's war scenes (Topic 1.23)."}}]},{"@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"AP Latin","item":"https://fiveable.me/ap-latin"},{"@type":"ListItem","position":2,"name":"Key Terms","item":"https://fiveable.me/ap-latin/key-terms"},{"@type":"ListItem","position":3,"name":"Unit 1","item":"https://fiveable.me/ap-latin/unit-1"},{"@type":"ListItem","position":4,"name":"centurion"}]}]}
```