During the period of the Roman Republic the legions had 4,200 infantry and 300 cavalry. During the early period of rule by emperors the legions had 5,120 infantry and four turmae (cavalry squadrons) of 30 horses, giving a total of 120 cavalry (132 including the officers). In the Later Empire the size of the legions was decreased and had about 1,000 infantry.
During the early period of rule by emperors, the Roman legion had 10 cohorts. Nine cohorts (cohorts 2 to 10) had six standard centuries with 80 men, giving a total of 480 men per cohort and an overall total of 4,320. The first cohort of elite soldiers had five double size centuries (160 men), giving a total of 800 men. This makes a grand total of 59 centuries and 5,120 infantrymen. This is a loose number, as a Roman legion was rarely at full strength. The smallest unit was the contubernium, a platoon of eight men who shared a tent.
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The number of legions depends on the period.
Some legions where destroyed in battle, example: Legio XVII, Legio XVIII and Legio XIX where destroyed in the Teutoburg forest and the Aquila* standards were lost - they were never rebuild.
Some where disbanded in disgrace, example: Legio I Germanica disbanded for cowardice in the Batavi revolt.
Legions were raised for war and the Roman Emperors created new legions as part of their rule as well.
We know that Augustus disbanded more than half of the 50+ legions in existence when he became emperor, the 28 remaining legions became the core of the army in the early empire (ca 30 BC - 284 AD), we also know that 46 different named legions existed in the course of the early empire.
But the total of legions at any given time is hard to tell.
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Chain of command for a legion: (Note: A legion was usually comprised of 10 Cohorts, each cohort was made of about 6 centuries, each century had 80 men plus the centurion)
Chain of Command:Legatus: Commander of the Legion, in charge of about 5,280 men.
Primus Pilus: Supreme Centurion of a Legion, Senior Centurion of the First Cohort, in charge of about 960 men.
Senior Centurion: Commander of a Cohort, in charge of about 480 men.
Primi Ordine: A Centurion in Command of a Century in the First Cohort, in charge of about 80 men.
Junior Centurion: Commander of a Century, in charge of about 80 men.
File Leader: Basically the leader of a file in a Century, not necessarily a Commander, but just a soldier who did have slight authority of about 10 men in a file.
That really depended upon the general. Roman generals recruited their own armies so there would be as many legions as; first, the general could afford and second, as many as he could convince to join his army.
Depending on the time, there were 4500 to 6000 men in a fully manned legion, including auxiliaries
A Roman legion had 10 cohorts. Cohorts 2 to 10 had 6 centuries of 80 men. The 1st cohort of elite soldiers had 5 double sized centuries. This makes a total of 59 centuries and 5,120 infantrymen. However, the number of men was relative as the size of legion varied and the centuries could have less than the mentioned number of men or, in exceptional emergencies, more. A legion also had a cavalry unit of 120 men
Become a legion? A legion was a section of a Roman army. A legion is about 6 thousand soldiers.
The eagle was the sacred symbol of the Roman legions. Each legion had one. It was the symbol of the legion's soul and a special shrine was put up for it at a legion's home base and also in the legion's marching camps.The eagle was the sacred symbol of the Roman legions. Each legion had one. It was the symbol of the legion's soul and a special shrine was put up for it at a legion's home base and also in the legion's marching camps.The eagle was the sacred symbol of the Roman legions. Each legion had one. It was the symbol of the legion's soul and a special shrine was put up for it at a legion's home base and also in the legion's marching camps.The eagle was the sacred symbol of the Roman legions. Each legion had one. It was the symbol of the legion's soul and a special shrine was put up for it at a legion's home base and also in the legion's marching camps.The eagle was the sacred symbol of the Roman legions. Each legion had one. It was the symbol of the legion's soul and a special shrine was put up for it at a legion's home base and also in the legion's marching camps.The eagle was the sacred symbol of the Roman legions. Each legion had one. It was the symbol of the legion's soul and a special shrine was put up for it at a legion's home base and also in the legion's marching camps.The eagle was the sacred symbol of the Roman legions. Each legion had one. It was the symbol of the legion's soul and a special shrine was put up for it at a legion's home base and also in the legion's marching camps.The eagle was the sacred symbol of the Roman legions. Each legion had one. It was the symbol of the legion's soul and a special shrine was put up for it at a legion's home base and also in the legion's marching camps.The eagle was the sacred symbol of the Roman legions. Each legion had one. It was the symbol of the legion's soul and a special shrine was put up for it at a legion's home base and also in the legion's marching camps.
The emblem of the 5th Alaudae Roman legion were a group of elephants. Historians believe the legion was formed to help Julius Caesar.
A legions was had 10 cohorts. Cohort 2 to 10 had six centuries each. the 1st cohort had 5 double sizes centuries.Thesmallestunit was the conternubium, a platoon of 8 men who shared a tent.