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Roman legion



 
 
For other uses, see legion


The Roman Legion (from Latin
Latin

Latin is an Italic language, historically spoken in Latium and Ancient Rome. Through the Military history of the Roman Empire, Latin spread throughout the Mediterranean and a large part of Europe....
 legio "military levy, conscription
Conscription

Conscription is a general term for involuntary labor demanded by an established authority. It is most often used in the specific sense of government policies that require citizens to serve in the military....
," from legere — "to choose") is a term that can apply both as a translation of legio ("conscription" or "army") to the entire Roman army
Army

An army , in the broadest sense, is the land-based armed forces of a nation. It may also include other branches of the military such as an air force....
 and also, more narrowly (and more commonly), to the heavy infantry
Heavy infantry

Heavy infantry refers to heavily armed and armoured ground troops, as opposed to Medium infantry or light infantry, in which the warriors are relatively lightly-armoured....
 that was the basic military unit of the ancient Roman army
Roman army

The Roman Army was employed by the Roman Kingdom, the Roman Republic and later the Roman Empire, as part of the Roman military. Its most important infantry constituent for much of its history was the Roman legion....
 in the period of the late Roman Republic
Roman Republic

The Roman Republic was the phase of the Ancient Rome characterized by a republican form of government; a period which began with the overthrow of the Roman Roman Kingdom, c....
 and the Roman Empire
Roman Empire

The Roman Empire was the Roman Republic phase of the Ancient Rome, characterised by an autocracy form of government and large territorial holdings in Europe and around the Mediterranean....
.






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For other uses, see legion


The Roman Legion (from Latin
Latin

Latin is an Italic language, historically spoken in Latium and Ancient Rome. Through the Military history of the Roman Empire, Latin spread throughout the Mediterranean and a large part of Europe....
 legio "military levy, conscription
Conscription

Conscription is a general term for involuntary labor demanded by an established authority. It is most often used in the specific sense of government policies that require citizens to serve in the military....
," from legere — "to choose") is a term that can apply both as a translation of legio ("conscription" or "army") to the entire Roman army
Army

An army , in the broadest sense, is the land-based armed forces of a nation. It may also include other branches of the military such as an air force....
 and also, more narrowly (and more commonly), to the heavy infantry
Heavy infantry

Heavy infantry refers to heavily armed and armoured ground troops, as opposed to Medium infantry or light infantry, in which the warriors are relatively lightly-armoured....
 that was the basic military unit of the ancient Roman army
Roman army

The Roman Army was employed by the Roman Kingdom, the Roman Republic and later the Roman Empire, as part of the Roman military. Its most important infantry constituent for much of its history was the Roman legion....
 in the period of the late Roman Republic
Roman Republic

The Roman Republic was the phase of the Ancient Rome characterized by a republican form of government; a period which began with the overthrow of the Roman Roman Kingdom, c....
 and the Roman Empire
Roman Empire

The Roman Empire was the Roman Republic phase of the Ancient Rome, characterised by an autocracy form of government and large territorial holdings in Europe and around the Mediterranean....
. In this latter meaning, it consisted of several cohort
Cohort (military unit)

A cohort is a fairly large military unit, generally consisting of one type of soldier....
s of heavy infantry
Infantry

Infantry are soldiers who are primarily trained for the role of fighting on foot. A soldier in the infantry is known as an infantryman. Infantry units have more physically demanding training than other branches of armies, and place a greater emphasis on fitness, physical strength and aggression....
 known as legionaries. It was almost always accompanied by one or more attached units of auxiliaries
Auxiliaries (Roman military)

Auxiliaries formed the standing non-citizen corps of the Roman army of the Principate , alongside the citizen Roman legion. By the 2nd century, the auxilia contained the same number of infantry as the legions and in addition provided almost all the Roman army's Roman cavalry and more specialised troops ....
, who were not Roman citizens and provided cavalry
Cavalry

The Cavalry is the second oldest of the Combat Arms, and as soldiers or warriors who fought mounted on horseback in combat, it represents the mobility and offensive power of the armed forces....
, ranged troops and skirmishers to complement the legion's heavy infantry.

The size of a typical legion varied widely throughout the history of ancient Rome, with complements of 4,200 legionaries and 300 equites in the republican period of Rome, (the infantry were split into 30 maniples
Maniple (military unit)

Maniple was a tactical unit of the Roman legion adopted from the Samnites during the Samnite Wars. It was also the name of the military insignia carried by such unit....
 of 120 legionaries each), to 5,200 men plus auxiliaries in the imperial period (split into 10 cohorts
Cohort (military unit)

A cohort is a fairly large military unit, generally consisting of one type of soldier....
, 9 of 480 men each, plus the first cohort holding 800 men).

As legions were not standing armies until the Marian reforms
Marian reforms

The Marian reforms of 107 BC were a group of military reforms initiated by Gaius Marius, a statesman and general of the Roman republic....
 (c. 107 BC), and were instead created, used, and disbanded again, several hundred legions were named and numbered throughout Roman history. To date, about 50 have been identified. In the time of the Early Roman Empire, there were usually about 25-35 standing legions plus their Auxiliaries, with more raised as needed. See List of Roman legions
List of Roman legions

This is a list of Roman legions, including key facts about each legion,primarily focusing on Principate legions, for which there exists substantial literary, epigraphic and archaeological evidence....
 for a catalogue of known late republic, early Empire and late Empire legions, with dates in existence, emblem and locations of deployment.

Because of the enormous military successes of the Roman Republic
Roman Republic

The Roman Republic was the phase of the Ancient Rome characterized by a republican form of government; a period which began with the overthrow of the Roman Roman Kingdom, c....
 and the Roman Empire
Roman Empire

The Roman Empire was the Roman Republic phase of the Ancient Rome, characterised by an autocracy form of government and large territorial holdings in Europe and around the Mediterranean....
 the legion has long been regarded as the prime ancient model for military efficiency and ability.

History


Roman kings (to c.500 BC)

In the early years of the Roman Kingdom and the Roman Republic, they did not use legions and instead used centuries of one hundred men which were banded together in random formats and only served the one who had hired them. In the Roman Empire the legions became, although the largest, only one part of the army (predominantly heavy infantry). But in the Roman Kingdom and Roman Republic up until the 2nd century BC, the centuries could be made of light troops and cavalry whose roles would later be taken on by allied troops. Until the 4th century BC the massive Greek phalanx
Phalanx formation

The phalanx is a rectangular mass military tactical formation, usually composed entirely of heavy infantry armed with spears, pike , or similar weapons....
 was the mode of battle. Roman soldiers would have thus looked much like Greek hoplite
Hoplite

The word hoplite derives from hoplon , meaning an item of armour or equipment, thus 'hoplite' may approximate to 'armoured man'. Hoplites were the citizen-soldiers of the Ancient Greece City-states....
s
.

Much of Roman history of this era is founded on legends, but it is believed that during the reign of Servius Tullius
Servius Tullius

Servius Tullius was the sixth legendary Roman king of ancient Rome and the second king of the Etruria dynasty. The traditional dates of his reign are 578-535 BC....
, the census
Census

A census is the procedure of systematically acquiring and recording information about the members of a given population. It is a regularly occurring and official count of a particular population....
 (the counting of the people) was introduced. With this, all Roman able-bodied, property-owning male citizens were divided into five classes for military service based on wealth, soldiers having to acquire their own weapons and equipment. These classes were further organized into units of 100 called centuries
Centuria

Centuria is a Latin substantive from the stem centum , denoting units consisting of 100 men. It also denotes a Roman unit of land area: 1 centuria = 100 Jugerum....
 (who also had a centurion, a second in command and a standard bearer).

Joining the army was both a duty and a distinguishing mark of Roman citizenship: during the entire pre-Marian period the wealthiest land owners performed the most years of military service, since these would have had the most to lose should the state have fallen.

The first class was armed in the fashion of the hoplite with spear, sword, helmet, breast plate and round shield (called clipeus
Clipeus

In the military of classical antiquity, a clipeus was a large shield worn by the Ancient Greece and Ancient Rome as a piece of defensive armor, which they carried upon the arm, to secure them from the blows of their enemies....
 in Latin
Latin

Latin is an Italic language, historically spoken in Latium and Ancient Rome. Through the Military history of the Roman Empire, Latin spread throughout the Mediterranean and a large part of Europe....
, similar to the Greek aspis
Aspis

An aspis is the generic term for the word shield. The aspis, which is carried by Ancient Greece infantry of various periods, is often referred to as a hoplon ....
, also called hoplon); there were 82 centuries of these of which 2 were trumpeteer. The second and third class also acted as spearmen, but with reduced armour, and the larger oval or rectangular shield. The fourth class could afford no armour, perhaps a small shield, and was armed with spear and javelin. All three of the latter classes made up about 26 centuries. The fifth and final class was composed only of slingers
Slingers

The Slingers are a group of fictional superheroes in the Marvel Comics universe. They starred in their own eponymous short-lived comic book....
. There were 32 of these of which 2 were engineers. The army officers as well as the cavalry were drawn from leading citizens who enrolled as equestrians (equites). (The equites were later put in smaller groups of 30 and were commanded by decurions (which strangely means commander of ten)), there were 18 centuries of equites.

Tactics were no different from those of the early Greeks and battles were joined on a plain. Spearmen would then deploy themselves in tightly packed rows. The members of each row closed to form a shield wall
Shield wall

The formation of shield wall, or Skjaldborg in Old Norse, is a military tactic that was common in many cultures in the Pre-Early Modern warfare age....
, their spears pointed forwards, and charged the enemy supported by their javelin throwers and slingers: the cavalry pursued the enemy, and sometimes dismounted to support the infantry in dire situations. It was a cumbersome military unit to manoeuvre, and easily defeated by mountain tribes such as Volsci or Samnites in rough terrains.

Early civilian authorities, called praetors, doubled as military leaders during the war season; lasting from spring to autumn. A formal war declaration included a religious ceremony that ended in the throwing of a ceremonial javelin into the enemy's territory to mark the start of hostilities.

Roman Republic (509-107 BC)

At some point, possibly in the beginning of the Roman Republic
Roman Republic

The Roman Republic was the phase of the Ancient Rome characterized by a republican form of government; a period which began with the overthrow of the Roman Roman Kingdom, c....
 after the kings were overthrown
Roman Republic

The Roman Republic was the phase of the Ancient Rome characterized by a republican form of government; a period which began with the overthrow of the Roman Roman Kingdom, c....
, the legio was subdivided into two separate legions, each one ascribed to one of the two consul
Consul

Consul was the highest elected office of the Roman Republic and an appointive office under the Roman Empire. The title was also used in other city states, and revived in modern states, notably French Republic before the Napoleon I of Franceic counter-revolution....
s. In the first years of the Republic, when warfare was mostly concentrated on raiding, it is uncertain if the full manpower of the legions was summoned at any one time. Legions became more formally organized in the 4th century BC, as Roman warfare evolved to more frequent and planned operations, and the consular army was raised to two legions.

In the Republic, legions had an ephemeral existence. Except for Legio I to IV, which were the consular armies (two per consul), other units were levied by campaign. Rome's Italian allies were required to provide a legion to support each Roman Legion.

In the middle of the Republic, legions were composed of the following units:
  • Equites (cavalry): The cavalry
    Cavalry

    The Cavalry is the second oldest of the Combat Arms, and as soldiers or warriors who fought mounted on horseback in combat, it represents the mobility and offensive power of the armed forces....
     was originally the most prestigious unit, where wealthy young Roman men displayed their skill and prowess, laying the foundation for an eventual political career. Cavalry equipment was purchased by each of the cavalrymen and consisted of a round shield, helmet, body armour, sword and one or more lance
    Lance

    The term lance has become a catchall for a variety of different pole weapons based on the spear. The name is derived from lancea, Ancient Rome auxiliaries' javelin, although according to the Oxford English Dictionary, the word may be of Iberian language origin....
    s. The cavalry was outnumbered in the legion. In a total of circa 3000 men, (plus the velites that normally enlarged the number to about 4200), the legion had only around 300 horsemen, divided into 10 units of 30 men. These men were commanded by decurion
    Decurion (military)

    A decurion was a cavalry officer in command of a troop or turma of thirty soldiers in the army of the Roman Empire. A Decurion was also in the first century AD a commander of a decuria, an eight-man group sleeping in the same tent....
    s. In addition to heavy cavalry, there would be the light cavalry levied from poor citizens and wealthy young citizens not old enough to be in the hastati or the equites. In battle, they were used to disrupt and outflank
    Flanking maneuver

    In military tactics, a flanking Maneuver warfare, also called a wiktionary:flank attack, is an attack on the sides of an opposing force....
     enemy infantry formations and to fight off enemy cavalry. In the latter type of engagement they would often (though not always) dismount some or all of the horsemen to fight a stationary battle on foot, an unusual tactic for the time, but one that offered significant advantages in stability and agility in a time before stirrup
    Stirrup

    The stirrup is a ring with a flat bottom fixed on a leather strap, usually hung from each side of a saddle by an adjustable strap to create a footrest for a person using a riding animal , used as a support for the foot of a rider when seated in the saddle and as an aid in mounting....
    s.


  • Velites
    Velites

    Velites were a class of infantry in the Polybian legions of the early Roman republic. Velites were light infantry and skirmishers who were armed with a number of light javelins, or hastae velitares, to fling at the enemy, and also carried short thrusting swords, or gladius for use in melee....
     (light infantry
    Light infantry

    Traditionally light infantry were soldiers whose job was to provide a skirmishing screen ahead of the main body of infantry, Harassment and delaying the enemy advance....
    ): The velites were mainly poorer citizens who couldn't afford to equip themselves properly. Their primary function was to act as skirmishers - javelin-throwers who would engage the enemy early in order either to harass them or to cover the movement of troops behind them. After throwing their javelins they would retreat through the gaps between the maniples, screened from the attack of the enemy by the heavy infantry lines. With the shortage of cavalry in the army of the early to mid Republican army, the velites
    Velites

    Velites were a class of infantry in the Polybian legions of the early Roman republic. Velites were light infantry and skirmishers who were armed with a number of light javelins, or hastae velitares, to fling at the enemy, and also carried short thrusting swords, or gladius for use in melee....
     were also used as scouts. They did not have a precise formal organization or formation.


  • Heavy infantry
    Heavy infantry

    Heavy infantry refers to heavily armed and armoured ground troops, as opposed to Medium infantry or light infantry, in which the warriors are relatively lightly-armoured....
    : This was the principal unit of the legion. The heavy infantry was composed of citizen legionaries that could afford the equipment composed of an iron helmet, shield, armour and pilum
    Pilum

    The pilum was a heavy javelin commonly used by the Military history of ancient Rome#Roman army in ancient times. It was generally about two meters long overall, consisting of an iron shank about 7 mm in diameter and 60 cm long with pyramidal head....
    , a heavy javelin whose range was about 30 meters. After 387 the preferred weapon for the hastati and principes was the gladius
    Gladius

    Gladius is a Latin word for sword. Early Ancient Rome swords were similar to those used by the Greeks. From the 3rd century BC, the Romans adopted swords similar to those used by the Celtiberians and others during the early part of the conquest of Hispania....
    , a short sword. Their hobnailed sandals (caligae
    Caligae

    Caligae are heavy-soled military shoes or Sandal which were worn by Roman legion soldiers and auxiliaries throughout the history of the Roman Republic and Roman Empire....
    ) were also an effective weapon against a fallen enemy. Prior to the Marian reforms (see below) the heavy infantry was subdivided, according to experience, into three separate lines of troops:
    • The hastati
      Hastati

      Hastati were a class of infantry in the Structural history of the Roman military#Manipular legion who originally fought as spearmen, and later as swordsmen....
       (sing. hastatus) consisted of raw or inexperienced soldiers, considered to be less reliable than legionaries of several years' service.
    • The principes
      Principes

      Principes were spearmen, and later swordsmen, in the Structural history of the Roman military#Manipular legion . They were men in the prime of their lives who were fairly wealthy, and could afford decent equipment....
       (sing. princeps) were men in their prime (late twenties to early thirties).
    • The triarii
      Triarii

      Triarii were spearmen in the Structural history of the Roman military#Manipular legion . They were the oldest and among the wealthiest men in the army, and could afford good quality equipment....
       (sing. triarius) were the veteran soldiers, to be used in battle only in extreme situations; they rested one knee down when not engaged in combat. The triarii served primarily as reserves or barrier troops
      Barrier troops

      Barrier troops, blocking units, or anti-retreat forces are formations of armed soldiers normally placed behind regular troops on a battle line to prevent panic or unauthorized withdrawal or retreat....
       designed to backstop the hastati and principes, and were equipped with long hastae
      Hasta (spear)

      Hasta is a Latin word meaning spear. Hastae were carried by early Roman Legionaries, in particular they were carried by and gave their name to those Roman soldiers known as Hastati....
       (spears) rather than the pilum and gladius (the hastati and principes stopped using spears in 387 B.C.). Thus armed, they fought in a phalanx formation
      Phalanx formation

      The phalanx is a rectangular mass military tactical formation, usually composed entirely of heavy infantry armed with spears, pike , or similar weapons....
      . The sight of an advancing armored formation of triarii legionaries frequently discouraged exultant enemies in pursuit of retreating hastati and principes troops. To fall upon the triarii was a Roman idiom
      Idiom

      An idiom is a phrase whose meaning cannot be determined by the literal definition of the phrase itself, but refers instead to a figurative language meaning that is known only through common use....
       - meaning to use one's last resort.


Each of these three lines was subdivided into maniple
Maniple (military unit)

Maniple was a tactical unit of the Roman legion adopted from the Samnites during the Samnite Wars. It was also the name of the military insignia carried by such unit....
s, each consisting of two centuries
Centuria

Centuria is a Latin substantive from the stem centum , denoting units consisting of 100 men. It also denotes a Roman unit of land area: 1 centuria = 100 Jugerum....
 of 60 men commanded by the senior of the two centurion
Centurion

Centurion may refer to:...
s. Centuries were normally 60 soldiers each at this time in the hastati and principes (no longer 100 men), with 120 strong maniples. There were generally 10 maniples of hastati, 10 maniples of principes and 10 of triarii which had two half strength centuries of 30 men, plus about 1200 velites and 300 cavalry which made up 10 units - 30 men strong. This gave the mid Republican legion a nominal strength of about 4500 men. Later on when the legions undertook the Marian reforms and was made up of 80 strong centuries each century had its standard and was made up of ten units called contubernia. In a contubernium, there would be eight soldiers who shared a tent, millstone, a mule and cooking pot (depending on duration of tour). Because maniples were their main tactical elements, the legions of the early Republic are sometimes referred to as Manipular legions.

Late Republic (107-30BC)

See also List of Roman legions
List of Roman legions

This is a list of Roman legions, including key facts about each legion,primarily focusing on Principate legions, for which there exists substantial literary, epigraphic and archaeological evidence....
 for details of notable late Republican legions


Following the Marian reforms of the 2nd century BC, the legions took on the second, narrower meaning that is familiar in the popular imagination as close-order citizen heavy infantry.

At the end of the 2nd century BC Gaius Marius
Gaius Marius

Gaius Marius was a Roman Republic general and politician elected consul an unprecedented seven times during his career. He was also noted for his dramatic Marian Reforms of Roman legion, authorizing recruitment of landless citizens and reorganizing the structure of the legions into separate Cohort ....
 reformed the previously ephemeral legions as a professional force drawing from the poorest classes, enabling Rome to field larger armies and providing employment for jobless citizens of the city of Rome. However, this put the loyalty of the soldiers in the hands of their general rather than Rome itself. In this period all Italian regions obtained full Roman citizenship and provided a larger basis for the army, supplemented by poor urban Romans.

The legions of the Late Republic and Early Empire are often called Marian legions. Following the Battle of Vercellae
Battle of Vercellae

The Battle of Vercellae, or Battle of the Raudine Plain, in 101 BC was the Roman republic victory of Consul Gaius Marius over the Germanic Cimbri invasion force near the settlement of Vercellae in Cisalpine Gaul....
 in 101 BC, Marius granted all Italian soldiers Roman citizenship. He justified this action to the Senate by saying that in the din of battle he could not distinguish Roman from ally. This effectively eliminated the notion of allied legions; henceforth all Italian legions would be regarded as Roman legions, and full Roman citizenship was open to all the regions of Italy. Thus the three different types of heavy infantry were replaced by a single, standard type based on the Principes: armed with two heavy javelins called pila (singular pilum
Pilum

The pilum was a heavy javelin commonly used by the Military history of ancient Rome#Roman army in ancient times. It was generally about two meters long overall, consisting of an iron shank about 7 mm in diameter and 60 cm long with pyramidal head....
), the short sword called gladius, chain mail (lorica hamata
Lorica hamata

The lorica hamata is a type of chainmail armour used by the Roman Republic and the Roman Empire. During the 1st century it was starting to be supplemented by lorica segmentata, but had been reintroduced as standard-issue armor by the 4th century....
) or banded armour (lorica segmentata
Lorica segmentata

The lorica segmentata was a type of segmented armour exclusively used in the Roman Empire, but the Latin name was first used in the 16th century ....
), helmet and rectangular shield (scutum
Scutum (shield)

Scutum is the Latin word for "shield", although it has in modern times come to be specifically associated with the rectangular, semi-cylinder body shield carried by Roman legion....
).

The role of allied legions would eventually be taken up by contingents of allied auxiliary troops, called Auxilia. Each legion had an auxilia of similar size, which contained specialist units, engineers and pioneers, artillerymen and craftsmen, service and support personnel and irregular units made up of non-citizens, mercenaries and local militia. These were usually formed into complete units such as light cavalry, light infantry
Light infantry

Traditionally light infantry were soldiers whose job was to provide a skirmishing screen ahead of the main body of infantry, Harassment and delaying the enemy advance....
 or velites
Velites

Velites were a class of infantry in the Polybian legions of the early Roman republic. Velites were light infantry and skirmishers who were armed with a number of light javelins, or hastae velitares, to fling at the enemy, and also carried short thrusting swords, or gladius for use in melee....
, and labourers. There was also a reconnaissance
Reconnaissance

Reconnaissance is a military and medical term denoting exploration conducted to gain information. Militarily, its shorthand Australian, Canadian, and British form is recce , its American usage form is recon ....
 squad
Squad

In military terminology, a squad is a small military unit led by a non-commissioned officer that is subordinate to an infantry platoon. In countries following the British Army tradition this organization is referred to as a section ....
 of 10 or more light mounted infantry
Mounted infantry

Mounted infantry were soldiers who rode horses instead of marching, but actually fought on foot in the modern era with muskets or rifles, but before that with spears and bows....
 called speculatores
Speculatores

Speculatores and Exploratores were the scouts and reconnaissance element of the Roman army.In both the Roman legion and in the praetorian guard camp, speculatores were initially Reconnaissance but became bodyguards, couriers, law-enforcers, and sometimes executioners....
 who could also serve as messengers or even as an early form of military intelligence
Military intelligence

Military intelligence , is a military service that uses List of intelligence gathering disciplines which informs the commanders' decision making process by providing intelligence analysis of Intelligence from a wide range of sources including forecast environmental changes , and opposing force intentions....
 service.

As part of the Marian reforms, the legions' internal organization was standardized. Each legion was divided into cohorts
Cohort (military unit)

A cohort is a fairly large military unit, generally consisting of one type of soldier....
. Prior to this, cohorts had been temporary administrative units or tactical task forces of several maniples, even more transitory than the legions themselves. Now the cohorts were ten permanent units, composed of 6 and in the case of the first cohort 8 centuries each led by a centurion assisted by an optio
Optio

An optio , sometimes anglicized option , was a soldier in the Roman army who held a position similar to that of an executive officer in modern armies....
, a soldier who could read and write. These came to form the basic tactical unit of the legions. The senior centurion of the legion was called the primus pilus
Primus Pilus

The Primus Pilus was a member of a Roman legion.In the late Roman republic, the cohort of which there were six to ten, became the basic tactical unit of the legions....
, a career soldier and advisor to the legate that sometimes was promoted to the higher rank.

Every legion had a baggage train of 640 mules or about 1 mule for every 8 legionaries. To keep these baggage trains from becoming too large and slow, Marius had each infantryman carry as much of his own equipment as he could, including his own armour, weapons and 15 days' rations, for about 25-30 kg (50–60 pounds) of load total. To make this easier, he issued each legionary a forked stick to carry their loads on their shoulders. The soldiers were nicknamed Marius' Mules because of the amount of gear they had to carry themselves. This arrangement allowed for the supply train to become detached from the main body of the legion, thus greatly increasing the army's speed while on the march.

A typical legion of this period had 5,120 legionaries as well as a large number of camp followers, servants and slaves. Legions could contain as many as 6,000 fighting men when including the auxiliaries, although much later in Roman history the number was reduced to 1,040 to allow for greater mobility. Numbers would also vary depending on casualties suffered during a campaign; Julius Caesar
Julius Caesar

'Gaius Julius Caesar' , July 13, 100 BC ? March 15, 44 BC,) was a Roman Republic military and political leader. He played a critical role in the transformation of the Roman Republic into the Roman Empire....
's legions during his campaign in Gaul often only had around 3,500 men.

Tactics were slightly different from the past, but largely improved because of the professional training of the soldiers.

Centurio 70 Ac
Roman Legionaire in Lorica Segmentata
After the Marian reforms, and throughout the history of Rome's Late Republic, the legions played an important political role. By the 1st century BC the threat of the legions under a demagogue was recognized. Governor
Roman governor

A Roman governor was an official either elected or appointed to be the chief administrator of Roman law throughout one or more of the many Roman province constituting the Roman Empire....
s were not allowed to leave their provinces with their legions. When Julius Caesar
Julius Caesar

'Gaius Julius Caesar' , July 13, 100 BC ? March 15, 44 BC,) was a Roman Republic military and political leader. He played a critical role in the transformation of the Roman Republic into the Roman Empire....
 broke this rule, leaving his province of Gaul and crossing the Rubicon
Rubicon

Rubicon is a 29 km long river in northern Italy.The river flows from the Apennine Mountains to the Adriatic Sea through the southern Emilia-Romagna region between the towns of Rimini and Cesena....
 into Italy, he precipitated a constitutional crisis
Constitutional crisis

A constitutional crisis is a severe breakdown in the orderly operation of government. Generally speaking, a constitutional crisis is a situation in which separate factions within a government disagree about the extent to which each of these factions hold sovereignty....
. This crisis and the civil wars which followed brought an end to the Republic and led to the foundation of the Empire
Roman Empire

The Roman Empire was the Roman Republic phase of the Ancient Rome, characterised by an autocracy form of government and large territorial holdings in Europe and around the Mediterranean....
 under Augustus in 27 BC.

Early Empire (30 BC-284 AD)

See Directory of Roman legions of the early Empire
List of Roman legions

This is a list of Roman legions, including key facts about each legion,primarily focusing on Principate legions, for which there exists substantial literary, epigraphic and archaeological evidence....


For political and economic reasons, Augustus reduced the number of legions from nearly 50 at the end of his war against Mark Antony
Mark Antony

Marcus Antonius , known in English as Marc Antony, was a Roman Republic politician and General. He was an important supporter and the best friend of Julius Caesar as a military commander and administrator, being Caesar's second cousin, once removed, by his mother Julia Antonia....
 to only 28 which decomposed to 25 after the Battle of Teutoburg Forest in which 3 legions were slaughtered. Generals during the recent Republican civil wars had formed their own legions and numbered them as they wished. When these wars ended, Augustus was left with around fifty legions, with several double counts (multiple Legio Xs for instance). Beside streamlining the army Augustus also regulated the soldiers' pay. During this time, there was a high incidence of Gemina (twin) legions, where two legions were consolidated into a single organization (and was later made official and put under a dux and six duces).

At the same time, he greatly increased the number of auxiliaries to the point where they were equal in number to the legionaries. He also created the Praetorian Guard
Praetorian Guard

The Praetorian Guard was a special force of guards used by Roman empire List of Roman Emperorss. Before being appropriated for the use of the Emperors' personal guards, the title was used for the guards of Roman generals, at least since the rise to prominence of the Scipio family around 275 BC....
 along with a permanent navy
Roman Navy

The Roman Navy comprised the naval forces of the Roman state. Although the navy was instrumental in the Roman conquest of the Mediterranean Sea basin, it never enjoyed the prestige of the Roman legions....
 where served the liberti, or freed slaves.

Augustus' military policies proved sound and cost effective, and were generally followed by his successors. These emperors would carefully add new legions, as circumstances required or permitted, until the strength of the standing army stood at around 30 legions. With each legion having 5,120 legionaries usually supported by an equal number of auxiliary troops, the total force available to a legion commander during the Pax Romana
Pax Romana

Pax Romana was the long period of relative peace and minimal expansion by military force experienced by the Roman Empire in the first century and second century Anno Domini....
 probably ranged from 153,600 downwards, with the more prestigious legions and those stationed on hostile borders or in restive provinces tending to have more auxiliaries. Some legions may have even been reinforced at times with units making the associated force near 15,000–16,000 or about the size of a modern division
Division (military)

A division is a large military unit or Formation usually consisting of between ten to thirty thousand soldiers. In most armies, a division is composed of several regiments or brigades, and in turn several divisions make up a corps....
.

Throughout the imperial
Roman Empire

The Roman Empire was the Roman Republic phase of the Ancient Rome, characterised by an autocracy form of government and large territorial holdings in Europe and around the Mediterranean....
 era, the legions played an important political role. Their actions could secure the empire for a usurper
Roman usurper

Usurpers are individuals or groups of individuals who obtain and maintain the power or rights of another by force and without legal authority. Usurpers were a common feature of the late Roman Empire, especially from the crisis of the third century onwards, when political instability became the rule....
 or take it away. For example, the defeat of Vitellius
Vitellius

Aulus Vitellius Germanicus, born Aulus Vitellius and commonly known as Vitellius , was a Roman Emperors who reigned from 16 April 69 to 22 December of the same year....
 in the Year of the Four Emperors
Year of the Four Emperors

The Year of the Four Emperors was a year in the history of the Roman Empire, AD 69, in which four emperors ruled in a remarkable succession. These four emperors were Galba, Otho, Vitellius, and Vespasian....
 was decided when the Danubian
Danube

The Danube is the longest river in the European Union and Europe's second longest river after the Volga.The river originates in the Black Forest in Germany as the much smaller Brigach and Breg River rivers which join at the eponymously named German town Donaueschingen, after which it is known as the Danube and flows eastwards for a distance...
 legions chose to support Vespasian
Vespasian

Titus Flavius Vespasianus, commonly known as Vespasian , was a Roman Emperor who reigned from 69 A.D. until his death in 79 A.D. Vespasian was the founder of the short lived Flavian dynasty, which ruled the Roman Empire between 69 A.D....
.

In the empire, the legion was standardized, with symbols and an individual history where men were proud to serve. The legion was commanded by a legatus
Legatus

A legatus was a general in the Roman army, equivalent to a modern general officer. Being of Roman senate rank, his immediate superior was the dux, and he outranked all military tribunes....
 or legate. Aged around thirty, he would usually be a senator on a three year appointment. Immediately subordinate to the legate would be six elected military tribunes — five would be staff officers and the remaining one would be a noble heading for the Senate (originally this tribune commanded the legion). There would also be a group of officers for the medical staff, the engineers, record-keepers, the praefectus castrorum (commander of the camp) and other specialists such as priests and musicians.

Late Empire (from 284)

Roman Soldier End of Third Century Northern Province
See List of Roman legions
List of Roman legions

This is a list of Roman legions, including key facts about each legion,primarily focusing on Principate legions, for which there exists substantial literary, epigraphic and archaeological evidence....
 for catalogue of late Empire legions


In the Later Roman Empire
Late Antiquity

Late Antiquity is a periodization used by historians to describe the transitional centuries from Classical antiquity to the Middle Ages, in both mainland Europe and the Mediterranean world: generally from the end of the Roman Empire's Crisis of the Third Century to the Islamic conquests and the re-organization of the Byzantine Empire under...
, the number of legions was increased and the Roman Army
Military establishment of the Roman empire

The principate of the Roman empire had no use for the republican army with its intense loyalties to competing generals. Beginning with the first emperor, Octavius Caesar, the principles totally replaced the citizen army with apparatus of professionals dedicated to carrying out the emperor's will in peace, disaster or war....
 expanded. There is no evidence to suggest that legions changed in form before the Tetrarchy
Tetrarchy

Tetrarchy can be applied to any system of government where power is divided between four individuals. The term is usually used to refer to the tetrarchy instituted by Roman Emperor Diocletian in 293 which lasted until c. 313....
, although there is evidence that they were smaller than the paper strengths usually quoted. The final form of the legion originated with the elite legiones palatinae created by Diocletian
Diocletian

Gaius Aurelius Valerius Diocletianus , born Diocles and commonly known as Diocletian , was Roman Emperor from November 20, 284 to May 1, 305....
 and the Tetrarchs. These were infantry units of around 1,000 men rather than the 5,000, including cavalry, of the old Legions. The earliest legiones palatinae were the Lanciarii, Joviani, Herculiani
Herculians

The Jovians and Herculians were the senior palatine imperial guard units of the Emperors of the late Roman Empire from the 290s until the 7th century....
 and Divitenses.

The 4th century saw a very large number of new, small legions created, a process which began under Constantine II
Constantine II (emperor)

Flavius Claudius Constantinus, known in English as Constantine II, was List of Roman Emperors from 337 to 340. The eldest son of Constantine the Great and Fausta, he was born at Arles, and was raised as a Christian....
. In addition to the elite palatinae, other legions called comitatenses
Comitatenses

Comitatenses is the Latin plural of comitatensis, originally the adjective derived from comitatus , itself rooting in Comes .However, historically it became the accepted name for those Roman Army which were not merely garrisoned at a limes ? the limitanei or ripenses, i.e....
 and pseudocomitatenses, along with the auxilia palatina
Auxilia palatina

Auxilia palatina were the late Roman Empire infantry units, first raised by Constantine I as part of the new field army he created in about 325....
, provided the infantry of late Roman armies. The Notitia Dignitatum
Notitia Dignitatum

The Notitia Dignitatum is a unique document of the Ancient Rome imperial chanceries. One of the very few surviving documents of Roman government, it details the administrative organisation of the eastern and western Roman empires, listing several thousand offices from the imperial court down to the provincial level....
 lists 25 legiones palatinae, 70 legiones comitatenses, 47 legiones pseudocomitatenses and 111 auxilia palatina in the field armies, and a further 47 legiones in the frontier armies. Legion names such as Honoriani
Honorius (emperor)

Flavius Honorius was Roman Emperor and then Western Roman Empire from 395 until his death. He was the younger son of Theodosius I and his first wife Aelia Flaccilla, and brother of the Eastern Emperor Arcadius....
 and Gratian
Gratian

Flavius Gratianus , known usually by the anglicised name Gratian, was a Western Roman Emperor from 375 to 383.He favoured the Christian religion against Roman polytheism, refusing the traditional polytheistic attributes of the emperors and removing the Altar of Victory from the Roman Senate....
enses
found in the Notitia suggest that the process of creating new legions continued through the 4th century rather than being a single event. The names also suggest that many new legions were formed from vexillatio
Vexillatio

A vexillatio was a detachment of a Roman legion formed as a temporary task force created by the Military history of ancient Rome of the Principate....
nes
or from old legions.

According to the late Roman writer Vegetius
Vegetius

Publius Flavius Vegetius Renatus was a writer of the Western Roman Empire. Nothing is known of his life or station beyond what he tells us in his two surviving works: Epitoma rei militaris , and the lesser-known Digesta Artis Mulomedicinae, a guide to veterinary medicine....
' De Re Militari
De Re Militari

De Re Militari is a treatise of Roman warfare and military principles written in the late Roman Empire, claiming to be a presentation of methods and practices in use during the height of Rome's power, and responsible for that power....
, each century had a ballista
Ballista

The ballista , plural ballistae, was a weapon developed from earlier Greek weapons. It relied upon different mechanics, using two levers with Torsion springs instead of a prod, the springs consisting of several loops of twisted skeins....
 and each cohort had an onager
Onager (siege weapon)

The onager was a post-classical Roman Empire siege engine, which derived its name from the kicking action of the machine, similar to that of an onager ....
, giving the legion a formidable siege train of 59 Ballistae and 10 Onagers each manned by 10 libritors (artillerymen) and mounted on wagons drawn by oxen or mules. In addition to attacking cities and fortifications, these would be used to help defend Roman forts and fortified camps (castra
Castra

The Latin language word castra, with its singular castrum, was used by the ancient Romans to mean buildings or plots of land reserved to or constructed for use as a military defensive position....
) as well. They would even be employed on occasion, especially in the later Empire, as field artillery
Field artillery

Field artillery is a category of mobile artillery used to support army in the field. These weapons are specialized for mobility, tactical proficiency, long range, short range and extremely long range target engagement....
 during battles or in support of river crossings.

Legionary ranks

Aside from the rank and file legionary (who received the base wage of 10 asses
As (coin)

The was a bronze, and later copper, coin used during the Roman Republic and Roman Empire, named after the homonymous weight unit , but not immune to weight depreciation....
 a day or 225 denarii
Denarius

The ancient Roman currency system included the 'denarius' after 211 BC, a small silver coin, and it was the most common coin produced for circulation but was slowly Debasement until its replacement by the antoninianus....
 a year), the following list describes the system of officers which developed within the legions from the Marian reforms (104 BC) until the military reforms of Diocletian
Diocletian

Gaius Aurelius Valerius Diocletianus , born Diocles and commonly known as Diocletian , was Roman Emperor from November 20, 284 to May 1, 305....
 (circa 290).

Senior officers

  • Dux
    Dux

    Dux is Latin for leader and for duke, and in Ancient Rome could refer to anyone who commanded troops, such as tribal leaders....
    , literally The Leader: A title of the later empire, or dominate
    Dominate

    The Dominate was the 'despotism' latter phase of government in the ancient Roman Empire from the conclusion of the Crisis of the Third Century of 235?284 until the formal date of the collapse of the Western Roman Empire in AD 476....
    , referring to a general in charge of two or more provincial military units. While the title of dux could refer to a Consul
    Consul

    Consul was the highest elected office of the Roman Republic and an appointive office under the Roman Empire. The title was also used in other city states, and revived in modern states, notably French Republic before the Napoleon I of Franceic counter-revolution....
     or Imperator
    Imperator

    The Latin word Imperator was a title originally roughly equivalent to commander during the period of the Roman Republic. It later went on to become a part of the titulature of the Roman Emperors as part of their cognomen....
    , it usually referred to the commander-in-chief of the limitaneii garrisoned within a province.


  • Legatus legionis
    Legatus

    A legatus was a general in the Roman army, equivalent to a modern general officer. Being of Roman senate rank, his immediate superior was the dux, and he outranked all military tribunes....
    , Legate: The overall legion commander. The post was usually filled by a senator
    Roman Senate

    The Senate of the Roman Republic was a political institution in the ancient Roman Republic. According to the Greek historian Polybius, our principal source on the Constitution of the Roman Republic, the Roman Senate was the predominant branch of government....
    , appointed by the emperor, who held command for 3 or 4 years, although he could serve for a much longer period. In a Roman province
    Roman province

    In Ancient Rome, a province was the basic, and until the Tetrarchy , largest territorial and administrative unit of the empire's territorial possessions outside of the Italia ....
     with only one legion, the legatus was also the provincial governor
    Roman governor

    A Roman governor was an official either elected or appointed to be the chief administrator of Roman law throughout one or more of the many Roman province constituting the Roman Empire....
     and in provinces with multiple legions, each legion had a legatus and the provincial governor had overall command of them all.


  • Tribunus laticlavius
    Tribune

    Tribune was a title shared by 10 elected officials in the Roman Republic. Tribunes had the power to convene the Plebeian Council and to act as its president, which also gave them the exclusive right to propose legislation before it....
    , Broad Band Tribune: Named for the broad striped tunic worn by men of senatorial rank, this tribune was appointed by the emperor or the Senate. Though generally quite young and less experienced than the tribuni angusticlavii, he served as second in command of the legion, behind the legate. Because of his age and inexperience he was not the actual second in command in battle, but if the legate died he would take command of the legion. This tribunate was often a first, but optional, step in a young man's senatorial career (see cursus honorum
    Cursus honorum

    The cursus honorum was the Sequence order of public offices held by aspiring politicians in both the Roman Republic and the early Roman Empire....
    ).


  • Praefectus castrorum
    Prefect

    Prefect is a magisterial title of varying definition.A prefect's office, department, or area of control is called a prefecture, but in various post-Roman cases there is a prefect without a prefecture or vice versa....
    , Camp Prefect: The Camp Prefect was third in command of the legion. Generally he was a long serving veteran of lower social status than the tribunii who previously had served as primus pilus and finished his 25 years with the legions. However, Camp Prefects were also on occasion appointed from aristocrats, in the same way as tribunes.


  • Tribuni angusticlavii
    Tribune

    Tribune was a title shared by 10 elected officials in the Roman Republic. Tribunes had the power to convene the Plebeian Council and to act as its president, which also gave them the exclusive right to propose legislation before it....
    , Narrow Band Tribune: Each legion had five more junior tribunes. They were normally young men of high birth who were not necessarily experienced. The more senior tribunus laticlavius rank existed to provide a more senior tribune to supervise these other tribunes.


Centurions


The most senior centurions were those of the five centuries of the first cohort. In the remaining cohorts, the six centurions were senior in order of their six centuries, the front centuries in the line of battle being most senior. Within the second to tenth cohorts, the seniority depended on the century, but if two centurions commanded the same century in their cohort, seniority was held by the centurion in the more senior cohort.

The six centuries of a normal cohort, were, in order of precedence:
  • The forward hastati (forward spears)
  • The rear hastati (rear spears)
  • The forward principes (forward principal line)
  • The rear principes (rear principal line)
  • The forward triarii (forward third line)
  • The rear triarii (rear third line)


The centuries took their titles from the old use of the legion drawn up in three lines of battle using three classes of soldier. (Each century would then hole a cross-section of this theoretical line, although these century titles were now essentially nominal.) Each of the three lines is then sub-divided within the century into a more forward and a more rear century.

  • Primus pilus
    Primus Pilus

    The Primus Pilus was a member of a Roman legion.In the late Roman republic, the cohort of which there were six to ten, became the basic tactical unit of the legions....
    , literally First File: The Primus Pilus was the commanding centurion of the first cohort and the senior centurion of the entire legion. He was called first file because he commanded the first file century of the first cohort. (Unlike other cohorts, the first cohort had only one javelin century, instead of a "front spear" and a "back spear" century). The Primus Pilus had a chance of later becoming a Praefectus Castrorum. When the primus pilus retired he would most likely gain entry into the equestrian class. He was paid 60 times the base wage.


  • Primi ordines: The "ranks of the first [cohort]" were the five centurions of the first cohort, and included the primus pilus. They, excluding the primus pilus, were paid 30 times the base wage. This rank is senior to all other centurions, save the primus pilus and pilus prior.


  • Pilus prior: The "front spear" centurions were the senior centurions of the cohorts. While the legion was in battle formation, the Pilus Prior was given command of the entire cohort. The Primus Pilus was also a Pilus Prior, and the most senior of all the centurions within the legion. These positions were usually held by experienced veteran soldiers who had been moved up within the ranks. This rank is subordinate to the Primus Pilus.


  • Other Centurion
    Centurion

    Centurion may refer to:...
    s
    : Each legion had 59 or 60 centurions, one to command each century of the 10 cohorts. They were the backbone of the professional army and were the career soldiers who ran the day to day life of the soldiers and issued commands in the field. They were generally moved up from the ranks, but in some cases could be direct appointments from the Emperor or other higher ranking officials. The cohorts were ranked from the first to the tenth and the century within each cohort ranked from 1 to 6, with only 5 centuries in the first cohort (for a total of 59 centurions and the primus pilus). The century that each centurion commanded was a direct reflection of his rank: command of the first century of the first cohort was the highest, and the 6th century of the 10th cohort was the lowest. An ordinary centurion was the approximate equivalent of a Captain
    Captain (Land)

    The army rank of Captain is an officer rank historically corresponding to command of a company of soldiers. The rank is also used by some air forces and Marine ....
     in a modern army. Paid ten times the basic wage.


Lower ranks

  • Optio
    Optio

    An optio , sometimes anglicized option , was a soldier in the Roman army who held a position similar to that of an executive officer in modern armies....
    : One for each centurion (59-60), they were appointed by the centurion from within the ranks to act as his second in command. Paid twice the basic wage.
  • Duplicarius
    Duplicarius

    A duplicary was an officer of the Roman legions receiving double the basic pay....
    : An officer paid double the basic pay.
  • Tesserarius
    Tesserarius

    A tesserarius , was a soldier in the Roman army who was responsible for getting the watchwords from the commander and seeing that it was kept safe....
    : (Guard commander) Again there were 59 of these, or one for each century. They acted seconds to the Optios. Paid one and a half times the basic wage.
  • Decurion: Commanded a cavalry unit of 10 to 30 Eques legionis.
  • Decanus: Commanded a contubernium
    Contubernium

    The contubernium was the smallest organized unit of soldiers in the Military history of ancient Rome and was comprised of eight legionaries, comparable to the modern squad, known as an octet....
     or eight man tent party.


Special duty posts

  • Aquilifer
    Aquilifer

    An aquilifer was a senior signifer bearing the eagle standard of a Roman legion. The name derives from the type of standard, aquila meaning "eagle", which was the universal type used since 104 BC; before that time the wolf, boar, Cattle and horse were also used....
    : A single position within the legion. The aquilifer was the legion's Standard or Aquila
    Aquila (Roman)

    The signa militaria were the Roman military ensigns or vexilloids. The most ancient standard employed by the Romans is said to have been a handful of straw fixed to the top of a spear or pole....
     (eagle) bearer and was an enormously important and prestigious position. Losing the aquila was considered a great dishonour. This post therefore had to be filled with steady veteran soldiers, with an excellent understanding of the tactics of the legion. He was paid twice the basic wage.


  • Signifer
    Signifer

    A signifer was a standard bearer of the Roman legions. He carried a signum for a cohort or centuria. The signum he carried was the military emblem of that unit....
    : Each century had a signifer (59). He was responsible for the men's pay and savings, and the standard bearer for the centurial signum, a spear shaft decorated with medallions and often topped with an open hand to signify the oath of loyalty taken by the soldiers. It was this banner that the men from each individual century would rally around. A soldier could also gain the position of discentes signiferorum, or standard bearer in training. He was paid twice the basic wage.


  • Cornicen
    Cornicen

    A cornicen was a junior officer in the Roman Army. The cornicen's job was to signal salutes to officers and sound orders to the legions. The cornicines played the Cornu ....
     (Horn blower): Worked hand in hand with the signifer drawing the attention of the men to the centurial signum and issuing the audible commands of the officers.


  • Imaginifer
    Imaginifer

    The imaginifer was a type of signifer during the Roman Empire, who carried the imago - the image - of the emperor. The imaginifer was added to the ranks of the cohorts when the Imperial Cult was first established during the reign of Augustus....
    : Carried the standard bearing the image of the Emperor as a constant reminder of the troops' loyalty to him.


Pay

From the time of Gaius Marius
Gaius Marius

Gaius Marius was a Roman Republic general and politician elected consul an unprecedented seven times during his career. He was also noted for his dramatic Marian Reforms of Roman legion, authorizing recruitment of landless citizens and reorganizing the structure of the legions into separate Cohort ....
 onwards, legionaries received 225 denarii
Denarius

The ancient Roman currency system included the 'denarius' after 211 BC, a small silver coin, and it was the most common coin produced for circulation but was slowly Debasement until its replacement by the antoninianus....
 a year; this basic rate remained unchanged until Domitian
Domitian

Titus Flavius Domitianus , commonly known as Domitian, was a Roman Emperor who reigned from 14 September 81 until his death. Domitian was the last emperor of the Flavian dynasty, which ruled the Roman Empire between 69 and 96, encompassing the reigns of Domitian's father Vespasian , his elder brother Titus , and that of Domitian himself...
, who increased it to 300 denarii. In spite of the steady inflation during the 2nd century, there was no further rise until the time of Septimius Severus
Septimius Severus

Lucius Septimius Severus was a Roman Empire general, and Roman Emperor from April 14 193 to 211. He was born in what is now the Libyan part of Rome's historic Africa Province, making him the first emperor to be born in the Roman province of Africa Province....
, who increased it to 500 denarii a year. However, the soldiers did not receive all the money in cash. From their pay was deducted the money spent by the state for clothing and feeding each soldier, therefore the net salary was not very high.

All legionary soldiers would also receive a sizeable sum of money on the completion of their term of service: 3000 denarii from the time of Augustus and/or a plot of good farmland (good land was in much demand). Later, under Caracalla
Caracalla

Caracalla , born Lucius Septimius Bassianus and later called Marcus Aurelius Antoninus and Marcus Aurelius Severus Antoninus, was the eldest son of Septimius Severus and Roman Emperor from 211 – 217....
, the praemia increased to 5000 denarii.

Symbols

From 104 BC onwards, each legion used an aquila
Aquila (Roman)

The signa militaria were the Roman military ensigns or vexilloids. The most ancient standard employed by the Romans is said to have been a handful of straw fixed to the top of a spear or pole....
 (eagle) as its standard symbol. The symbol was carried by an officer known as aquilifer
Aquilifer

An aquilifer was a senior signifer bearing the eagle standard of a Roman legion. The name derives from the type of standard, aquila meaning "eagle", which was the universal type used since 104 BC; before that time the wolf, boar, Cattle and horse were also used....
, and its loss was considered to be a very serious embarrassment, and often led to the disbanding of the legion itself. Normally this was due to the fact that any legion incapable of regaining its eagle in battle was so severely mauled it was no longer a workable fighting force.

In Gallic War (Bk IV, Para. 25), Julius Caesar describes an incident at the start of his first invasion of Britain in 55BC that illustrated how fear for the safety of the eagle could drive Roman soldiers. When Caesar's troops hesitated to leave their ships for fear of the Britons, the aquilifer of the tenth legion
Legio X Gemina

Legio decima Gemina , was one of the four legions used by Julius Caesar in 58 BC, for his invasion of Gaul. There are still records of the X Gemina in Vienna in the beginning of the 5th century....
  threw himself overboard and, carrying the eagle, advanced alone against the enemy. His comrades, fearing disgrace, 'with one accord, leapt down from the ship' and were followed by troops from the other ships.

With the birth of the Roman Empire, the legions created a bond with their leader, the emperor himself. Each legion had another officer, called imaginifer
Imaginifer

The imaginifer was a type of signifer during the Roman Empire, who carried the imago - the image - of the emperor. The imaginifer was added to the ranks of the cohorts when the Imperial Cult was first established during the reign of Augustus....
, whose role was to carry a pike with the imago (image, sculpture) of the emperor as pontifex maximus
Pontifex Maximus

The Pontifex Maximus was the high priest of the Ancient Rome College of Pontiffs. This was the most important position in the Ancient Roman religion, open only to patricians until 254 BC, when a plebeian first occupied this post....
.

Each legion, furthermore, had a vexillifer who carried a vexillum or signum, with the legion name and emblem depicted on it, unique to the legion. It was common for a legion to detach some sub-units from the main camp to strengthen other corps. In these cases, the detached subunits carried only the vexillum, and not the aquila, and were called, therefore, vexillatio
Vexillatio

A vexillatio was a detachment of a Roman legion formed as a temporary task force created by the Military history of ancient Rome of the Principate....
nes
. A miniature vexillum, mounted on a silver base, was sometimes awarded to officers as a recognition of their service upon retirement or reassignment.

Civilians could also be rewarded for their assistance to the Roman Legions. In return for outstanding service, a citizen was given an arrow without a head
Arrow without a head

The Arrow without a head was a Ancient Rome award for civilians.It was awarded to officials in the civil administration who contributed to the victories of the Roman legions....
.

Discipline


The military discipline of the legions was quite harsh. Regulations were strictly enforced, and a broad array of punishments could be inflicted upon a legionary who broke them. Many legionaries became devotees in the cult of the minor goddess Disciplina
Disciplina

In Roman mythology, Disciplina was a minor deity and the personification of discipline. The word disciplina itself, a Latin noun, is multi-faceted in meaning; it refers to education and training, self-control and determination, knowledge in a field of study, and an orderly way of life....
, whose virtues of frugality, severity and loyalty were central to their code of conduct and way of life.

Minor punishments
  • Castigatio - being hit by the centurion with his staff or animadversio fustium (Tac. Annals I, 23)
  • - Reduction of rations or to be forced to eat barley instead of the usual grain ration
  • Pecuniaria multa - Reduction in pay, fines or deductions from the pay allowance
  • - Flogging in front of the century, cohort or legion
  • - Whipping with the flagrum (flagellum, flagella), or "short whip" — a much more brutal punishment than simple flogging. The "short whip" was used for slave volunteers, volones, who comprised the majority of the army in the later years of the Roman Empire.
  • Gradus deiectio - Reduction in rank
  • Missio ignominiosa - Dishonourable discharge
  • - Loss of time in service advantages
  • Militiae mutatio - Relegation to inferior service or duties.
  • Munerum indictio - Additional duties


Major punishments
  • Fustuarium
    Fustuarium

    Fustuarium was a Roman military form of execution by Club , which was imitated by later armies.Since laxness on guard duty or desertion could endanger the entire corps and even the Roman state, a slacking soldier was liable to be found as unworthy of the uniform, stripped, and beaten to death with sticks by his comrades, whose trust he ha...
     — a sentence for desertion or dereliction of duty. The legionary would be stoned or beaten to death by cudgels, in front of the assembled troops, by his fellow soldiers, whose lives had been put in danger. Soldiers under sentence of fustuarium who escaped were not pursued, but lived under sentence of banishment from Rome.
  • Decimation
    Decimation (Roman Army)

    Decimation was a form of military discipline used by officers in the Roman Army to punish mutinous or cowardly soldiers. The word decimation is derived from Latin meaning "removal of a tenth."...
     — a sentence carried out against an entire unit which had mutinied, deserted, or shown dereliction of duty. One out of every ten men, chosen by lots, would be beaten to death, usually by the other nine, who would be forced to live outside the camp and in some instances obliged to renew the military oath, the sacramentum
    Sacramentum

    The Sacramentum was an oath taken by all Roman legion on entering the Roman army.On the rare chance of punishment by Decimation , the surviving legionaries were often required to renew this military oath, which was the foundation of Roman military discipline....
    .


Factors in the legion's success

  • As Montesquieu wrote, "[I]t should be noted that the main reason for the Romans becoming masters of the world was that, having fought successively against all peoples, they always gave up their own practices as soon as they found better ones."
    Examples of ideas that were copied and adapted include weapons like the gladius
    Gladius

    Gladius is a Latin word for sword. Early Ancient Rome swords were similar to those used by the Greeks. From the 3rd century BC, the Romans adopted swords similar to those used by the Celtiberians and others during the early part of the conquest of Hispania....
     (Spanish Iberians) and warship design (Carthaginians), as well as military units such as heavy mounted cavalry and mounted archers (Persians).


  • Roman organization was more flexible than those of many opponents. Over time, the legions effectively handled challenges ranging from cavalry, to guerrillas, to siege warfare.


  • Roman discipline, organization and systematization sustained combat effectiveness over a longer period. These elements appear throughout the legion in training, logistics, field fortification etc.


  • The Romans were more persistent and more willing to absorb and replace losses over time than their opponents. Wars with Carthage, the Parthians and barbarian forces illustrate this.


  • Roman leadership was mixed, but over time it was often effective in securing Roman military success.


  • The influence of Roman military and civic culture, as embodied particularly in the heavy infantry legion, gave the Roman military consistent motivation and cohesion.


  • Strict, and more importantly, uniform discipline made commanding, maintaining, and replacing Roman legionaries a much more consistent exercise. Roman opponents tended to be tribal peoples without military science
    Military science

    Military science is the process of translating national defence policy to produce military capability by employing military scientists, including: theorists, researchers, experimental scientists, applied scientists, designers, engineers, test technicians, and military personnel responsible for prototyping....
    .


  • Roman military equipment, particularly armour, was far more ubiquitous and heavy, especially in the late Republican / Early Imperial era, than that of most of their opponents. Soldiers equipped with shields, helmets and highly effective body armor had a major advantage over warriors protected, in many cases, with nothing other than their shields, particularly in a prolonged engagement.


  • Roman engineering skills were second to none in the ancient world, and their mastery of both offensive and defensive siege warfare, specifically the construction and investiture of fortifications, was another major advantage for the Roman Legions.


See also


  • For a more detailed analysis, as well as the Romans in battle, see the articles Roman infantry tactics and Roman military personal equipment.
  • Auxiliaries (Roman military)
    Auxiliaries (Roman military)

    Auxiliaries formed the standing non-citizen corps of the Roman army of the Principate , alongside the citizen Roman legion. By the 2nd century, the auxilia contained the same number of infantry as the legions and in addition provided almost all the Roman army's Roman cavalry and more specialised troops ....
  • List of Roman wars
    List of Roman wars

    The following is a List of Roman wars fought by the ancient Roman Kingdom, Roman Republic and Roman Empire, organized by date....
  • List of Roman battles
    List of Roman battles

    The following is a list of Roman Battles fought by the Roman Kingdom, the Roman Republic, the Roman Empire, and sometimes the Byzantine Empire, organized by date....
  • List of topics related to ancient Rome
  • List of Roman legions
    List of Roman legions

    This is a list of Roman legions, including key facts about each legion,primarily focusing on Principate legions, for which there exists substantial literary, epigraphic and archaeological evidence....
  • List of Roman auxiliary regiments
    List of Roman auxiliary regiments

    This article contains listings of Roman auxiliary regiments attested in the epigraphic record, by province of deployment in the 2nd century AD, the period in which there is the most abundant evidence....
  • Military history of ancient Rome
    Military history of ancient Rome

    From its origin as a city-state in History of Italy during Roman times in 9th century BC, the rise as an Roman Empire covering much of Eurasia and North Africa and fall in the 5th century AD of Ancient Rome was often closely entwined with its military history....
  • Structural history of the Roman military
    Structural history of the Roman military

    The structural history of the Roman military describes the major chronological transformations in the organization and constitution of ancient Rome's Military of ancient Rome, "the most effective and long-lived military institution known to history"....


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    Living history

    Living history is an activity that incorporates historical tools, activities and dress into an interactive presentation that seeks to give observers and participants a sense of stepping back in time....
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