Roman legions

Quick Facts: Who was Roman legions?

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Roman legions

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The largest military unit of the Roman army, evolving from manipular to cohort-based formations.

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Origins & Early Life

The Roman legion (Latin: legiō, Latin: [ˈɫɛɡioː]) was the largest military unit of the Roman army, composed of Roman citizens serving as legionaries. During the Roman Republic the manipular legion comprised 4,200 infantry and 300 cavalry. In late Republican times the legions were formed of 5,200 men and were restructured around 10 cohorts, the first cohort being double strength. This structure persisted throughout the Principate and middle Empire, before further changes in the fourth century resulted in new formations of around 1,000 men. The size of a typical legion varied throughout the history of ancient Rome, with complements ranging from 4,200 legionaries and 300 equites (drawn from the wealthier classes – in early Rome all troops provided their own equipment) in the Republic, to 5,500 in the Imperial period, when most legions were led by a Roman Imperial Legate.

Career & Major Achievements

A legion had 4,800 legionaries (in 10 cohorts of 6 centuries of 80 legionaries) from the late republic to the time of Julius Caesar. It expanded to 5,280 men plus 120 auxiliaries in the Imperial period (split into 10 cohorts, nine of 480 men each, with the first cohort being almost double-strength at 800 men). These are typical field strengths while "paper strength" was slightly higher (e.g. 600 and 1,200 respectively for Imperial cohorts). In the early Roman Kingdom the term legion may have meant the entire Roman army, but sources on this period are few and unreliable. The subsequent organisation of legions varied greatly over time but legions were typically composed of around five thousand soldiers.

Enduring Legacy & Impact

During much of the republican era, a legion was divided into three lines, each of ten maniples. In the late Republic and much of the imperial period (from about 100 BC), a legion was divided into ten cohorts, each of six (or five) centuries. Legions also included a small ala, or cavalry unit. By the third century AD, the legion was a much smaller unit of about 1,000 to 1,500 men, and there were more of them. In the fourth century AD, East Roman border guard legions (limitanei) may have become even smaller.

Notable Quotes by Roman legions

“Quintili Vare, legiones redde!”

Historical Fact-Check Quiz: Roman legions

True or False: “The legionary was always a full-time professional soldier paid consistently throughout their service.”

Answer (FALSE ❌): In the early Republic, legionaries were not paid well and often relied on looting from battlefields for income.

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Frequently Asked Questions about Roman legions