List Of Roman Legions
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Roman legion The Roman legion ( la, legiō, ) was the largest military unit of the Roman army, composed of 5,200 infantry and 300 equites (cavalry) in the period of the Roman Republic (509 BC–27 BC) and of 5,600 infantry and 200 auxilia in the period of ...
s, including key facts about each legion, primarily focusing on the
Principate The Principate is the name sometimes given to the first period of the Roman Empire from the beginning of the reign of Augustus in 27 BC to the end of the Crisis of the Third Century in AD 284, after which it evolved into the so-called Dominate. ...
(early Empire, 27 BC – 284 AD) legions, for which there exists substantial literary, epigraphic and archaeological evidence. When
Augustus Caesar Augustus (born Gaius Octavius; 23 September 63 BC – 19 August AD 14), also known as Octavian, was the first Roman emperor; he reigned from 27 BC until his death in AD 14. He is known for being the founder of the Roman Pri ...
became sole ruler in 31 BC, he disbanded about half of the over 50 legions then in existence. The remaining 28 legions became the core of the early Imperial army of the
Principate The Principate is the name sometimes given to the first period of the Roman Empire from the beginning of the reign of Augustus in 27 BC to the end of the Crisis of the Third Century in AD 284, after which it evolved into the so-called Dominate. ...
(27 BC – AD 284), most lasting over three centuries. Augustus and his immediate successors transformed legions into permanent units, staffed by entirely career soldiers on standard 25-year terms. During the
Dominate The Dominate, also known as the late Roman Empire, is the name sometimes given to the "despotic" later phase of imperial government in the ancient Roman Empire. It followed the earlier period known as the "Principate". Until the empire was reunit ...
period (near the end of the Empire, 284–476), legions were also professional, but are little understood due to scarcity of evidence compared to the Principate. What is clear is that late legions were radically different in size, structure, and tactical role from their predecessors, despite several retaining early period names. This was the result of the military reforms of Emperors
Diocletian Diocletian (; la, Gaius Aurelius Valerius Diocletianus, grc, Διοκλητιανός, Diokletianós; c. 242/245 – 311/312), nicknamed ''Iovius'', was Roman emperor from 284 until his abdication in 305. He was born Gaius Valerius Diocles ...
and
Constantine I Constantine I ( , ; la, Flavius Valerius Constantinus, ; ; 27 February 22 May 337), also known as Constantine the Great, was Roman emperor from AD 306 to 337, the first one to Constantine the Great and Christianity, convert to Christiani ...
, and of further developments during the 4th century. The legions were identified by
Roman numerals Roman numerals are a numeral system that originated in ancient Rome and remained the usual way of writing numbers throughout Europe well into the Late Middle Ages. Numbers are written with combinations of letters from the Latin alphabet, eac ...
, though the spelling sometimes differed from the modern standard. For example, in addition to the spellings "IV", "IX", "XIV", "XVIII" and "XIX", the respective spellings "IIII", "VIIII", "XIIII", "XIIX" and "XVIIII" were commonly used. Legions also bore a ''cognomen'' or nickname. While neither a legion's number or ''cognomen'' were likely unique enough to identify it, the combination of the two is usually needed to identify a specific legion. For example, both Legio III Cyrenaica and
Legio III Gallica Legio III Gallica ( Third Legion "Gallic") was a legion of the Imperial Roman army. The cognomen ''Gallica'' suggests that its earliest recruits came from veterans of the Gallic legions of Gaius Julius Caesar, a supposition supported by its e ...
were distinct, long-standing legions of the late Republic and Imperial periods. To visually identify legions, they also bore a specific emblem, a symbolic representation of the legion, frequently an animal or mythological figure, which appeared on the
vexillum The ''vexillum'' (; plural ''vexilla'') was a flag-like object used as a military standard by units in the Ancient Roman army. Use in Roman army The word ''vexillum'' is a derivative of the Latin word, ''velum'', meaning a sail, which con ...
, a small rectangular flag that served as the legion's standard and carried both the emblem and name of the legion.


Late Republican legions

Until the
Marian reforms The Marian reforms were reforms of the ancient Roman army implemented in 107 BC by the statesman Gaius Marius, for whom they were later named. The reforms originated as a reaction to the military and logistical stagnation of the Roman Republic in ...
of 107 BC, the
Republican Republican can refer to: Political ideology * An advocate of a republic, a type of government that is not a monarchy or dictatorship, and is usually associated with the rule of law. ** Republicanism, the ideology in support of republics or agains ...
legions were formed by compulsory levy of Roman citizens (who met a minimum property qualification) and raised whenever it was necessary. Usually they were authorized by the
Roman Senate The Roman Senate ( la, Senātus Rōmānus) was a governing and advisory assembly in ancient Rome. It was one of the most enduring institutions in Roman history, being established in the first days of the city of Rome (traditionally founded in ...
, and were later disbanded.
Gaius Marius Gaius Marius (; – 13 January 86 BC) was a Roman general and statesman. Victor of the Cimbric and Jugurthine wars, he held the office of consul an unprecedented seven times during his career. He was also noted for his important refor ...
' reforms transformed legions into standing units, which could remain in being for several years, or even decades. This became necessary to garrison the Republic's now far-flung territories. Legionaries started large-scale recruiting of volunteer soldiers enlisted for a minimum term of six years and a fixed salary, although conscription was still practiced. The property requirements were abolished by Marius, so that the bulk of recruits were henceforth from the landless citizens, who would be most attracted to the paid employment and land offered after their service. In the last century of the Republic,
proconsul A proconsul was an official of ancient Rome who acted on behalf of a consul. A proconsul was typically a former consul. The term is also used in recent history for officials with delegated authority. In the Roman Republic, military command, or ' ...
s governing frontier provinces became increasingly powerful. Their command of standing legions in distant and arduous military campaigns resulted in the allegiance of those units transferring from the Roman state to themselves. These ''imperatores'' (lit: victorious generals, from the title
imperator The Latin word ''imperator'' derives from the stem of the verb la, imperare, label=none, meaning 'to order, to command'. It was originally employed as a title roughly equivalent to ''commander'' under the Roman Republic. Later it became a part o ...
they were hailed with by their troops) frequently fell out with each other and started civil wars to seize control of the state, such as
Sulla Lucius Cornelius Sulla Felix (; 138–78 BC), commonly known as Sulla, was a Roman general and statesman. He won the first large-scale civil war in Roman history and became the first man of the Republic to seize power through force. Sulla had ...
,
Caesar Gaius Julius Caesar (; ; 12 July 100 BC – 15 March 44 BC), was a Roman people, Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in Caes ...
,
Pompey Gnaeus Pompeius Magnus (; 29 September 106 BC – 28 September 48 BC), known in English as Pompey or Pompey the Great, was a leading Roman general and statesman. He played a significant role in the transformation of ...
,
Crassus Marcus Licinius Crassus (; 115 – 53 BC) was a Roman general and statesman who played a key role in the transformation of the Roman Republic into the Roman Empire. He is often called "the richest man in Rome." Wallechinsky, David & Wallace, I ...
,
Mark Antony Marcus Antonius (14 January 1 August 30 BC), commonly known in English as Mark Antony, was a Roman politician and general who played a critical role in the transformation of the Roman Republic from a constitutional republic into the autoc ...
and Octavian (later
Augustus Caesar Augustus (born Gaius Octavius; 23 September 63 BC – 19 August AD 14), also known as Octavian, was the first Roman emperor; he reigned from 27 BC until his death in AD 14. He is known for being the founder of the Roman Pri ...
, the first Emperor himself). In this context, the ''imperatores'' raised many legions that were not authorised by the Senate, sometimes having to use their own resources. As civil wars were resolved, many of these "private" units would be disbanded, only for more to be raised to fight the next civil war. By the time Augustus emerged as sole ruler of Rome in 31 BC, over 50 legions were in existence, many of which were disbanded. The legions included in the following list had a long enough history to be somehow remarkable. Most of them were levied by Julius Caesar and later included into
Octavian Caesar Augustus (born Gaius Octavius; 23 September 63 BC – 19 August AD 14), also known as Octavian, was the first Roman emperor; he reigned from 27 BC until his death in AD 14. He is known for being the founder of the Roman Pri ...
's army, some of them were levied by Marc Antony. * Legio I ''Germanica'' (''Germanic''): 48 BC – AD 70 (
Revolt of the Batavi The Revolt of the Batavi took place in the Roman province of Germania Inferior between AD 69 and 70. It was an uprising against the Roman Empire started by the Batavi, a small but militarily powerful Germanic tribe that inhabited Batavia, on t ...
),
Julius Caesar Gaius Julius Caesar (; ; 12 July 100 BC – 15 March 44 BC), was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war, and ...
* Legio II ''Sabina'' (''Sabine''): 43 BC – , early name of the Legio II ''Augusta'' * Legio III ''Cyrenaica'' (''from Cyrene''): probably to (at least) the 5th century,
Mark Antony Marcus Antonius (14 January 1 August 30 BC), commonly known in English as Mark Antony, was a Roman politician and general who played a critical role in the transformation of the Roman Republic from a constitutional republic into the autoc ...
* Legio III ''Gallica'' (''Gallic''): around 49 BC to at least early 4th century,
Julius Caesar Gaius Julius Caesar (; ; 12 July 100 BC – 15 March 44 BC), was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war, and ...
(emblem:
bull A bull is an intact (i.e., not castrated) adult male of the species ''Bos taurus'' (cattle). More muscular and aggressive than the females of the same species (i.e., cows), bulls have long been an important symbol in many religions, includin ...
) * Legio IV ''Macedonica'' (''Macedonian''): 48 BC – AD 70 (renamed by
Vespasian Vespasian (; la, Vespasianus ; 17 November AD 9 – 23/24 June 79) was a Roman emperor who reigned from AD 69 to 79. The fourth and last emperor who reigned in the Year of the Four Emperors, he founded the Flavian dynasty that ruled the Empi ...
),
Julius Caesar Gaius Julius Caesar (; ; 12 July 100 BC – 15 March 44 BC), was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war, and ...
(emblem:
bull A bull is an intact (i.e., not castrated) adult male of the species ''Bos taurus'' (cattle). More muscular and aggressive than the females of the same species (i.e., cows), bulls have long been an important symbol in many religions, includin ...
, capricorn) * Legio IV ''Scythica'' (''from Scythia''): to at least early 5th century,
Mark Antony Marcus Antonius (14 January 1 August 30 BC), commonly known in English as Mark Antony, was a Roman politician and general who played a critical role in the transformation of the Roman Republic from a constitutional republic into the autoc ...
(emblem: capricorn) * Legio V ''Alaudae'' (''Larks''): 52 BC – AD 70 or 86 (destroyed either during the
Batavian rebellion The Revolt of the Batavi took place in the Roman province of Germania Inferior between AD 69 and 70. It was an uprising against the Roman Empire started by the Batavi, a small but militarily powerful Germanic tribe that inhabited Batavia, on th ...
or by the Dacians in
first Battle of Tapae Domitian's Dacian War was a conflict between the Roman Empire and the Dacian Kingdom, which had invaded the province of Moesia. The war occurred during the reign of the Roman emperor Domitian, in the years 86–88 AD. Dacian attack and def ...
),
Julius Caesar Gaius Julius Caesar (; ; 12 July 100 BC – 15 March 44 BC), was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war, and ...
(emblem:
elephant Elephants are the largest existing land animals. Three living species are currently recognised: the African bush elephant, the African forest elephant, and the Asian elephant. They are the only surviving members of the family Elephantidae an ...
) * Legio VI ''Ferrata'' (''Ironclad''): 52 BC – after 250,
Julius Caesar Gaius Julius Caesar (; ; 12 July 100 BC – 15 March 44 BC), was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war, and ...
(emblem:
bull A bull is an intact (i.e., not castrated) adult male of the species ''Bos taurus'' (cattle). More muscular and aggressive than the females of the same species (i.e., cows), bulls have long been an important symbol in many religions, includin ...
, she-wolf and
Romulus and Remus In Roman mythology, Romulus and Remus (, ) are twin brothers whose story tells of the events that led to the founding of the city of Rome and the Roman Kingdom by Romulus, following his fratricide of Remus. The image of a she-wolf suckling the ...
); twin legion of Legio VI ''Victrix'' * Legio VI ''Victrix'' (''Victorious''): 41 BC – after 402,
Octavian Caesar Augustus (born Gaius Octavius; 23 September 63 BC – 19 August AD 14), also known as Octavian, was the first Roman emperor; he reigned from 27 BC until his death in AD 14. He is known for being the founder of the Roman Pri ...
(emblem:
bull A bull is an intact (i.e., not castrated) adult male of the species ''Bos taurus'' (cattle). More muscular and aggressive than the females of the same species (i.e., cows), bulls have long been an important symbol in many religions, includin ...
) * Legio VII ''Claudia Pia Fidelis'' (''loyal and faithful to Claudius''): 51 BC – 44 BC,
Julius Caesar Gaius Julius Caesar (; ; 12 July 100 BC – 15 March 44 BC), was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war, and ...
; disbanded and re-formed by
Vespasian Vespasian (; la, Vespasianus ; 17 November AD 9 – 23/24 June 79) was a Roman emperor who reigned from AD 69 to 79. The fourth and last emperor who reigned in the Year of the Four Emperors, he founded the Flavian dynasty that ruled the Empi ...
as Legio VII ''Gemina'' * Legio VIII ''Augusta'': 59 BC – 48 BC,
Julius Caesar Gaius Julius Caesar (; ; 12 July 100 BC – 15 March 44 BC), was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war, and ...
, disbanded and re-enlisted by Augustus as Legio VIII ''Augusta'' *
Legio IX ''Hispana'' Legio was a Roman military camp south of Tel Megiddo in the Roman province of Galilee. History Following the Bar Kokhba Revolt (132-136CE), Legio VI Ferrata was stationed at Legio near Caparcotna. The approximate location of the camp of the Le ...
''Triumphalis'' (''Triumphant''): 59 BC – 48 BC,
Julius Caesar Gaius Julius Caesar (; ; 12 July 100 BC – 15 March 44 BC), was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war, and ...
, disbanded and re-enlisted by Augustus as
Legio IX ''Hispana'' Legio was a Roman military camp south of Tel Megiddo in the Roman province of Galilee. History Following the Bar Kokhba Revolt (132-136CE), Legio VI Ferrata was stationed at Legio near Caparcotna. The approximate location of the camp of the Le ...
* Legio X ''Fretensis'' (''of the sea strait''): levied by
Augustus Caesar Augustus (born Gaius Octavius; 23 September 63 BC – 19 August AD 14), also known as Octavian, was the first Roman emperor; he reigned from 27 BC until his death in AD 14. He is known for being the founder of the Roman Pri ...
in 41–40 BC *
Legio X Equestris Legio X ''Equestris'', a Roman legion, was levied by Julius Caesar in 61 BC when he was the Governor of Hispania Ulterior. The Tenth was the first legion levied personally by Caesar and was consistently his most trusted. Legio X was famous in i ...
(''Equestrian''): before 58 BC – 45 BC,
Julius Caesar Gaius Julius Caesar (; ; 12 July 100 BC – 15 March 44 BC), was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war, and ...
's personal legion *
Legio XI Claudia Legio XI Claudia ("Claudius' Eleventh Legion") was a legion of the Imperial Roman army. The legion was levied by Julius Caesar for his campaign against the Nervii. XI ''Claudia'' dates back to the two legions (the other was the XIIth) recruit ...
: 58 BC – 45 BC,
Julius Caesar Gaius Julius Caesar (; ; 12 July 100 BC – 15 March 44 BC), was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war, and ...
(emblem:
Neptune Neptune is the eighth planet from the Sun and the farthest known planet in the Solar System. It is the fourth-largest planet in the Solar System by diameter, the third-most-massive planet, and the densest giant planet. It is 17 times ...
), disbanded, reconstituted by Augustus * Legio XII ''Victrix'' (''Victorious''): 57 BC – AD 45,
Julius Caesar Gaius Julius Caesar (; ; 12 July 100 BC – 15 March 44 BC), was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war, and ...
* Legio XII ''Fulminata'' (''Thunderbolt''): after being renamed by Augustus, first reconstituted by Lepidus in 43 BC, named by
Mark Antony Marcus Antonius (14 January 1 August 30 BC), commonly known in English as Mark Antony, was a Roman politician and general who played a critical role in the transformation of the Roman Republic from a constitutional republic into the autoc ...
as Legio XII ''Antiqua'' (''Ancient'') * Legio XIII ''Gemina'' (''Twin''): 57 BC – 45 BC:
Julius Caesar Gaius Julius Caesar (; ; 12 July 100 BC – 15 March 44 BC), was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war, and ...
, later (41 BC) reconstituted by Augustus. The legion that crossed the Rubicon with Caesar on his assault on Rome. * Legio XIV ''Gemina'' (''Twin''): 57 BC – 48 BC:
Julius Caesar Gaius Julius Caesar (; ; 12 July 100 BC – 15 March 44 BC), was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war, and ...
, destroyed and reconstituted in 53 BC. Reconstituted by Augustus after 41 BC * Legio XVII ''Classica'' (''Of the Fleet''): raised by
Mark Antony Marcus Antonius (14 January 1 August 30 BC), commonly known in English as Mark Antony, was a Roman politician and general who played a critical role in the transformation of the Roman Republic from a constitutional republic into the autoc ...
, disbanded in 31 BC by
Octavian Caesar Augustus (born Gaius Octavius; 23 September 63 BC – 19 August AD 14), also known as Octavian, was the first Roman emperor; he reigned from 27 BC until his death in AD 14. He is known for being the founder of the Roman Pri ...
following his victory at the
Battle of Actium The Battle of Actium was a naval battle fought between a maritime fleet of Octavian led by Marcus Agrippa and the combined fleets of both Mark Antony and Cleopatra VII Philopator. The battle took place on 2 September 31 BC in the Ionian Sea, nea ...
. * Legio XVIII ''Libyca'' (''from Libya''): raised by
Mark Antony Marcus Antonius (14 January 1 August 30 BC), commonly known in English as Mark Antony, was a Roman politician and general who played a critical role in the transformation of the Roman Republic from a constitutional republic into the autoc ...
, disbanded in 31 BC by
Octavian Caesar Augustus (born Gaius Octavius; 23 September 63 BC – 19 August AD 14), also known as Octavian, was the first Roman emperor; he reigned from 27 BC until his death in AD 14. He is known for being the founder of the Roman Pri ...
following his victory at the
Battle of Actium The Battle of Actium was a naval battle fought between a maritime fleet of Octavian led by Marcus Agrippa and the combined fleets of both Mark Antony and Cleopatra VII Philopator. The battle took place on 2 September 31 BC in the Ionian Sea, nea ...
. *
Legio XIX Legio XIX ("Nineteenth Legion") was a legion of the Imperial Roman army. It was destroyed in 9 AD in the Battle of the Teutoburg Forest. The emblem of the XIXth legion is unknown but was probably the Capricorn like other legions levied by Augu ...
: raised by
Mark Antony Marcus Antonius (14 January 1 August 30 BC), commonly known in English as Mark Antony, was a Roman politician and general who played a critical role in the transformation of the Roman Republic from a constitutional republic into the autoc ...
, disbanded in 31 BC by
Octavian Caesar Augustus (born Gaius Octavius; 23 September 63 BC – 19 August AD 14), also known as Octavian, was the first Roman emperor; he reigned from 27 BC until his death in AD 14. He is known for being the founder of the Roman Pri ...
following his victory at the
Battle of Actium The Battle of Actium was a naval battle fought between a maritime fleet of Octavian led by Marcus Agrippa and the combined fleets of both Mark Antony and Cleopatra VII Philopator. The battle took place on 2 September 31 BC in the Ionian Sea, nea ...
. * Legio XX Siciliana: raised by
Octavian Caesar Augustus (born Gaius Octavius; 23 September 63 BC – 19 August AD 14), also known as Octavian, was the first Roman emperor; he reigned from 27 BC until his death in AD 14. He is known for being the founder of the Roman Pri ...
for the purpose of launching an invasion of Sicily in 36 BC, which at the time was held by
Sextus Pompeius Sextus Pompeius Magnus Pius ( 67 – 35 BC), also known in English as Sextus Pompey, was a Roman military leader who, throughout his life, upheld the cause of his father, Pompey the Great, against Julius Caesar and his supporters during the las ...
. * : 49 BC – 42 BC,
Julius Caesar Gaius Julius Caesar (; ; 12 July 100 BC – 15 March 44 BC), was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war, and ...
, destroyed in 42 BC while crossing the Adriatic during the
Liberators' civil war The Liberators' civil war (43–42 BC) was started by the Second Triumvirate to avenge Julius Caesar's assassination. The war was fought by the forces of Mark Antony and Octavian (the Second Triumvirate members) against the forces of Caesar's ...
. * : 47 BC – 31 BC,
Julius Caesar Gaius Julius Caesar (; ; 12 July 100 BC – 15 March 44 BC), was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war, and ...
* : 49 BC – 30 BC,
Julius Caesar Gaius Julius Caesar (; ; 12 July 100 BC – 15 March 44 BC), was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war, and ...
* (''Naval''): 48 BC – 41 BC,
Julius Caesar Gaius Julius Caesar (; ; 12 July 100 BC – 15 March 44 BC), was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war, and ...


Early Empire legions

Codes for Roman provinces in the table: :


Legend


Legion number and title (cognomen)

The numbering of the legions is confusing, since several legions shared the same number with others. Augustus numbered the legions he founded himself from I, but also inherited numbers from his predecessors. Each emperor normally numbered the legions he raised himself starting from I. However, even this practice was not consistently followed. For example,
Vespasian Vespasian (; la, Vespasianus ; 17 November AD 9 – 23/24 June 79) was a Roman emperor who reigned from AD 69 to 79. The fourth and last emperor who reigned in the Year of the Four Emperors, he founded the Flavian dynasty that ruled the Empi ...
kept the same numbers as before for legions he raised from disbanded units.
Trajan Trajan ( ; la, Caesar Nerva Traianus; 18 September 539/11 August 117) was Roman emperor from 98 to 117. Officially declared ''optimus princeps'' ("best ruler") by the senate, Trajan is remembered as a successful soldier-emperor who presi ...
's first legion was numbered XXX because there were 29 other legions in existence at the time it was raised; but the second Trajanic legion was given the sequential number II. XVII, XVIII and XIX, the numbers of the legions annihilated in the
Teutoburg Forest The Teutoburg Forest ( ; german: Teutoburger Wald ) is a range of low, forested hills in the German states of Lower Saxony and North Rhine-Westphalia. Until the 17th century, the official name of the hill ridge was Osning. It was first renamed th ...
, were never used again. (These three legions are without titles, suggesting that in disgrace their titles may have been deliberately forgotten or left unmentioned.) As a result of this somewhat chaotic evolution, the legion's title became necessary to distinguish between legions with the same number. Legions often carried several titles, awarded after successive campaigns, normally by the ruling emperor e.g. XII Fulminata was also awarded: ''paterna'' (fatherly), ''victrix'' (victorious), ''antiqua'' (venerable), ''certa constans'' (reliable, steadfast) and ''Galliena'' (
Gallienus Publius Licinius Egnatius Gallienus (; c. 218 – September 268) was Roman emperor with his father Valerian from 253 to 260 and alone from 260 to 268. He ruled during the Crisis of the Third Century that nearly caused the collapse of the empi ...
'). ''Pia fidelis'' (loyal and faithful), ''fidelis constans'' and others were titles awarded to several legions, sometimes several times to the same legion. Only the most established, commonly used titles are displayed on this table. The geographical titles indicate * the country a legion was originally recruited e.g. ''Italica'' = from Italy or * peoples the legion has vanquished e.g.''Parthica'' = victorious over the
Parthians Parthian may be: Historical * A demonym "of Parthia", a region of north-eastern of Greater Iran * Parthian Empire (247 BC – 224 AD) * Parthian language, a now-extinct Middle Iranian language * Parthian shot, an archery skill famously employed by ...
Legions bearing the personal name of an emperor, or of his ''gens'' (clan) (e.g. ''Augusta'', ''Flavia'') were either founded by that Emperor or awarded the name as a mark of special favour. The title GEMINA means that two diminished legions have been combined to make one new one.


Main legionary base

This shows the ''
castra In the Roman Republic and the Roman Empire, the Latin word ''castrum'', plural ''castra'', was a military-related term. In Latin usage, the singular form ''castrum'' meant 'fort', while the plural form ''castra'' meant 'camp'. The singular and ...
'' (base) where the legion spent the longest period during the Principate. Legions often shared the same base with other legions. Detachments of legions were often seconded for lengthy periods to other bases and provinces, as operational needs demanded.


Emblem

Legions often sported more than one emblem at the same time, and occasionally changed them. Legions raised by Caesar mostly carried a bull emblem originally; those of Augustus mostly a Capricorn


Date disbanded

For legions that are documented into the 4th century and beyond, we do not know when or how they were terminated. For legions disappearing from the record before 284, the reason (certain or likely) is given as: *XX = annihilated in battle *DD = disbanded in disgrace *UF = unknown fate


Castra legionaria

Indicates the bases (''castra'') and/or
provinces A province is almost always an administrative division within a country or state. The term derives from the ancient Roman ''provincia'', which was the major territorial and administrative unit of the Roman Empire's territorial possessions outsi ...
where the legion was based during its history, with dates.


Notes

Contains points of note, including explanation of titles and details of a legion's fate. Province names and borders are assumed throughout the Principate period as at 107, during the rule of
Trajan Trajan ( ; la, Caesar Nerva Traianus; 18 September 539/11 August 117) was Roman emperor from 98 to 117. Officially declared ''optimus princeps'' ("best ruler") by the senate, Trajan is remembered as a successful soldier-emperor who presi ...
, and after the annexation of
Dacia Dacia (, ; ) was the land inhabited by the Dacians, its core in Transylvania, stretching to the Danube in the south, the Black Sea in the east, and the Tisza in the west. The Carpathian Mountains were located in the middle of Dacia. It thus r ...
and
Arabia Petraea Arabia Petraea or Petrea, also known as Rome's Arabian Province ( la, Provincia Arabia; ar, العربية البترائية; grc, Ἐπαρχία Πετραίας Ἀραβίας) or simply Arabia, was a frontier province of the Roman Empi ...
. The map above shows provinces at the end of Trajan's reign, 117. They are the same as in 107, except that Armenia and Mesopotamia have been annexed (they were abandoned soon after Trajan's death); and
Pannonia Pannonia (, ) was a province of the Roman Empire bounded on the north and east by the Danube, coterminous westward with Noricum and upper Italy, and southward with Dalmatia and upper Moesia. Pannonia was located in the territory that is now wes ...
has been split into two (the split occurred ). In reality provincial borders were modified several times between 30 BC and 284: this explains any discrepancy with other sources, as to a legion's location at a particular date.


Late Empire legions

Diocletian Diocletian (; la, Gaius Aurelius Valerius Diocletianus, grc, Διοκλητιανός, Diokletianós; c. 242/245 – 311/312), nicknamed ''Iovius'', was Roman emperor from 284 until his abdication in 305. He was born Gaius Valerius Diocles ...
reorganized the Roman army, in order to better counter the threat of the
Germanic peoples The Germanic peoples were historical groups of people that once occupied Central Europe and Scandinavia during antiquity and into the early Middle Ages. Since the 19th century, they have traditionally been defined by the use of ancient and ear ...
of northern Europe as well as that of the
Persians The Persians are an Iranian ethnic group who comprise over half of the population of Iran. They share a common cultural system and are native speakers of the Persian language as well as of the languages that are closely related to Persian. ...
from the East. The army was formed by ''border'' and ''field'' units. The ''border'' (''
limitanei The ''līmitāneī'' (Latin, also called ''rīpēnsēs''), meaning respectively "the soldiers in frontier districts" (from the Latin phrase līmēs, meaning a military district of a frontier province) or "the soldiers on the riverbank" (from the ...
'') units were to occupy the
limes Limes may refer to: * the plural form of lime (disambiguation) * the Latin word for ''limit'' which refers to: ** Limes (Roman Empire) (Latin, singular; plural: ) is a modern term used primarily for the Germanic border defence or delimiting ...
, the structured border fortifications, and were formed by professional soldiers with an inferior training. The ''field'' units were to stay well behind the border, and to move quickly where they were needed, with both offensive and defensive roles. Field units were formed by elite soldiers with high-level training and weapons. They were further divided into: # ''
Scholae Scholae ( el, Σχολαί) is a Latin word, literally meaning "schools" (from the singular ''schola'', ''school'' or ''group'') that was used in the late Roman Empire to signify a unit of Imperial Guards. The unit survived in the Byzantine Empire ...
'': the personal guard of the Emperor, created by
Constantine I Constantine I ( , ; la, Flavius Valerius Constantinus, ; ; 27 February 22 May 337), also known as Constantine the Great, was Roman emperor from AD 306 to 337, the first one to Constantine the Great and Christianity, convert to Christiani ...
to replace the
Praetorian Guard The Praetorian Guard (Latin: ''cohortēs praetōriae'') was a unit of the Imperial Roman army that served as personal bodyguards and intelligence agents for the Roman emperors. During the Roman Republic, the Praetorian Guard were an escort fo ...
; # ''
Palatina The ''palatini'' (Latin for "palace troops") were elite units of the Late Roman army mostly attached to the ''comitatus praesentales'', or imperial escort armies. In the elaborate hierarchy of troop-grades, the ''palatini'' ranked below the ''scho ...
e'': "palace troops" were the highest ranked units, created by
Constantine I Constantine I ( , ; la, Flavius Valerius Constantinus, ; ; 27 February 22 May 337), also known as Constantine the Great, was Roman emperor from AD 306 to 337, the first one to Constantine the Great and Christianity, convert to Christiani ...
after he disbanded the Praetorian Guard, it was comprised originally of former guardsmen; # ''
Comitatenses The comitatenses and later the palatini were the units of the field armies of the late Roman Empire. They were the soldiers that replaced the legionaries, who had formed the backbone of the Roman military since the Marian reforms. Organization ...
'': regular field units, some were newly-formed, others were descended from Early-Empire legions; # ''
Pseudocomitatenses Pseudocomitatenses were a class of regiment in the Late Roman army. Although they were attached to the ''comitatus'' (higher-grade mobile armies), they enjoyed lower status and pay to the ''comitatenses'', the regular regiments of the ''comitatus'' ...
'': these were ''limitanei'' units diverted into the field army and often kept there; some Early Empire legions became ''pseudocomitatenses'' units. These units usually numbered between 300 and 2,000 soldiers and some of them kept their original numbering schemes. The primary source for the legions of this era is the ''
Notitia Dignitatum The ''Notitia Dignitatum'' (Latin for "The List of Offices") is a document of the late Roman Empire that details the administrative organization of the Western and the Eastern Roman Empire. It is unique as one of very few surviving documents of ...
'', a late 4th-century document containing all the civil and military offices of both halves of the Roman Empire (revised in for the Western Empire). * Legio I ** I ''Armeniaca'' ** I ''Flavia Constantia'' (''reliable Flavian''): ''comitatensis'' unit under the command of the ''
Magister militum (Latin for "master of soldiers", plural ) was a top-level military command used in the later Roman Empire, dating from the reign of Constantine the Great. The term referred to the senior military officer (equivalent to a war theatre commander, ...
per Orientis'' ** I ''Flavia Gallicana Constantia'' (''reliable Flavian legion from Gallia'')'': pseudocomitatensis'' under the command of the ''Magister Peditum per Gallias.'' The legion was founded by
Constantius I Chlorus Flavius Valerius Constantius "Chlorus" ( – 25 July 306), also called Constantius I, was Roman emperor from 305 to 306. He was one of the four original members of the Tetrarchy established by Diocletian, first serving as caesar from 293 t ...
. The legions objective was to protect the Armorican coast and fight the Roman-British usurper, Allectus. ** I ''Flavia Martis'' (''Flavian legion devoted to Mars''): ''pseudocomitatensis.'' The legion was founded by Constantius Chlorus to fight Allectus. It was stationed in
Gaul Gaul ( la, Gallia) was a region of Western Europe first described by the Romans. It was inhabited by Celtic and Aquitani tribes, encompassing present-day France, Belgium, Luxembourg, most of Switzerland, parts of Northern Italy (only during ...
. ** I ''Flavia Pacis'' (''Flavian legion of peace''): ''comitatensis'' under the command of the ''
Magister Peditum (Latin for "master of soldiers", plural ) was a top-level military command used in the later Roman Empire, dating from the reign of Constantine the Great. The term referred to the senior military officer (equivalent to a war theatre commander, ...
'' ** I ''Flavia Theodosiana'': ''comitatensis.'' ** I ''Illyricorum'' (''of the Illyrians''): stationed at the Camp of Diocletian in
Palmyra Palmyra (; Palmyrene: () ''Tadmor''; ar, تَدْمُر ''Tadmur'') is an ancient city in present-day Homs Governorate, Syria. Archaeological finds date back to the Neolithic period, and documents first mention the city in the early second ...
** I ''Iovia'' (''devoted to Jupiter''): levied by Diocletian, stationed in
Scythia Minor Scythia Minor or Lesser Scythia (Greek: , ) was a Roman province in late antiquity, corresponding to the lands between the Danube and the Black Sea, today's Dobruja divided between Romania and Bulgaria. It was detached from Moesia Inferior by th ...
** I ''Isaura Sagittaria'' (''archers from Isauria''): ''pseudocomitatensis'' under the command of the ''
Magister militum (Latin for "master of soldiers", plural ) was a top-level military command used in the later Roman Empire, dating from the reign of Constantine the Great. The term referred to the senior military officer (equivalent to a war theatre commander, ...
per Orientis'' ** I ''Iulia Alpina'': ''pseudocomitatensis'' under the command of the ''Magister Peditum'' in
Italy Italy ( it, Italia ), officially the Italian Republic, ) or the Republic of Italy, is a country in Southern Europe. It is located in the middle of the Mediterranean Sea, and its territory largely coincides with the homonymous geographical re ...
. It is unknown who founded the legion although it was probably
Crispus Flavius Julius Crispus (; 300 – 326) was the eldest son of the Roman emperor Constantine I, as well as his junior colleague ( ''caesar'') from March 317 until his execution by his father in 326. The grandson of the ''augustus'' Constantius I ...
or
Constans Flavius Julius Constans ( 323 – 350), sometimes called Constans I, was Roman emperor from 337 to 350. He held the imperial rank of ''caesar'' from 333, and was the youngest son of Constantine the Great. After his father's death, he was made ...
. ** I ''Martia'' possibly based near modern
Kaiseraugst Kaiseraugst (Swiss German: ''Chäiseraugscht'') is a municipality within the district of Rheinfelden in the canton of Aargau in Switzerland. It is named after the Ancient Roman city of Augusta Raurica whose ruins are situated nearby. The pref ...
. The Legion could have had the surname ''Victrix''. The legion was probably founded by
Diocletian Diocletian (; la, Gaius Aurelius Valerius Diocletianus, grc, Διοκλητιανός, Diokletianós; c. 242/245 – 311/312), nicknamed ''Iovius'', was Roman emperor from 284 until his abdication in 305. He was born Gaius Valerius Diocles ...
. It also may have built forts in Valeria. ** I ''Maximiana Thaebanorum'' (''the Thebans of Maximianus''): ''comitatensis'' unit stationed near
Thebes, Egypt , image = Decorated pillars of the temple at Karnac, Thebes, Egypt. Co Wellcome V0049316.jpg , alt = , caption = Pillars of the Great Hypostyle Hall, in ''The Holy Land, Syria, Idumea, Arabia, Egypt, and Nubia'' , map_type ...
, and probably fighting in the
battle of Adrianople The Battle of Adrianople (9 August 378), sometimes known as the Battle of Hadrianopolis, was fought between an Eastern Roman army led by the Eastern Roman Emperor Valens and Gothic rebels (largely Thervings as well as Greutungs, non-Gothic A ...
** I ''Noricorum'' (''of the Noricans''): stationed in
Noricum Noricum () is the Latin name for the Celts, Celtic kingdom or federation of tribes that included most of modern Austria and part of Slovenia. In the first century AD, it became a Roman province, province of the Roman Empire. Its borders were th ...
. The legion was probably founded by Diocletian to help defend the
Danube The Danube ( ; ) is a river that was once a long-standing frontier of the Roman Empire and today connects 10 European countries, running through their territories or being a border. Originating in Germany, the Danube flows southeast for , pa ...
. ** I ''Pontica:'' the legion was founded by Dioceltian to help defend
Pontus Polemoniacus Pontus or Pontos may refer to: * Short Latin name for the Pontus Euxinus, the Greek name for the Black Sea (aka the Euxine sea) * Pontus (mythology), a sea god in Greek mythology * Pontus (region), on the southern coast of the Black Sea, in modern ...
. The legion was stationed in
Trapezus Trabzon (; Ancient Greek: Tραπεζοῦς (''Trapezous''), Ophitic Pontic Greek: Τραπεζούντα (''Trapezounta''); Georgian: ტრაპიზონი (''Trapizoni'')), historically known as Trebizond in English, is a city on the B ...
. * Legio II ** II ''Armeniaca'' ** II ''Britannica'': ''comitatensis'' under ''Magister Peditum'' ** II ''Flavia Constantia'': ''comitatensis'' under the command of the ''Magister Peditum'' ** II ''Flavia Virtutis'': ''comitatensis'' under the command of the ''Magister Peditum'' ** II ''Herculia'' (''devoted to Hercules''): levied by Diocletian, stationed in Scythia Minor ** II ''Isaura'' ** II ''Iulia Alpina'': ''pseudocomitatensis'' under the command of the ''Magister Peditum'', in ''Comes Illyricum'' command. It was probably founded by
Crispus Flavius Julius Crispus (; 300 – 326) was the eldest son of the Roman emperor Constantine I, as well as his junior colleague ( ''caesar'') from March 317 until his execution by his father in 326. The grandson of the ''augustus'' Constantius I ...
or
Constans Flavius Julius Constans ( 323 – 350), sometimes called Constans I, was Roman emperor from 337 to 350. He held the imperial rank of ''caesar'' from 333, and was the youngest son of Constantine the Great. After his father's death, he was made ...
. Its objective was to defend
Alpes Cottiae The Alpes Cottiae (; English: 'Cottian Alps') were a small province of the Roman Empire founded in 63 AD by Emperor Nero. It was one of the three provinces straddling the Alps between modern France and Italy, along with the Alpes Graiae et Poenin ...
** II ''Felix Valentis Thebaeorum'': ''comitatensis'' * Legio III ** III ''Diocletiana'' ** III ''Flavia Salutis'' The Legio III Flacia Salutis was a
comitatensis The comitatenses and later the palatini were the units of the field armies of the late Roman Empire. They were the soldiers that replaced the legionaries, who had formed the backbone of the Roman military since the Marian reforms. Organization ...
legion of the Late
Roman Empire The Roman Empire ( la, Imperium Romanum ; grc-gre, Βασιλεία τῶν Ῥωμαίων, Basileía tôn Rhōmaíōn) was the post-Republican period of ancient Rome. As a polity, it included large territorial holdings around the Mediterr ...
. The legion was raised by either
Constantius II Constantius II (Latin: ''Flavius Julius Constantius''; grc-gre, Κωνστάντιος; 7 August 317 – 3 November 361) was Roman emperor from 337 to 361. His reign saw constant warfare on the borders against the Sasanian Empire and Germani ...
or
Diocletian Diocletian (; la, Gaius Aurelius Valerius Diocletianus, grc, Διοκλητιανός, Diokletianós; c. 242/245 – 311/312), nicknamed ''Iovius'', was Roman emperor from 284 until his abdication in 305. He was born Gaius Valerius Diocles ...
. The legion was used to guard
North Africa North Africa, or Northern Africa is a region encompassing the northern portion of the African continent. There is no singularly accepted scope for the region, and it is sometimes defined as stretching from the Atlantic shores of Mauritania in ...
. The Legio III Flavia Salutis was under the command of the
Magister Militum (Latin for "master of soldiers", plural ) was a top-level military command used in the later Roman Empire, dating from the reign of Constantine the Great. The term referred to the senior military officer (equivalent to a war theatre commander, ...
in the west. **III ''Herculea'': ''comitatensis'' under the command of the ''Comes Illyricum'' ** III ''Isaura'' ** III ''Iulia Alpina'': ''comitatensis'' under the command of the ''Magister Peditum'' command in
Italy Italy ( it, Italia ), officially the Italian Republic, ) or the Republic of Italy, is a country in Southern Europe. It is located in the middle of the Mediterranean Sea, and its territory largely coincides with the homonymous geographical re ...
* Legio IV ** IV ''Italica'' ** IV ''Martia'' ** IV ''Parthica'' * Legio V ** V ''Iovia'' (maybe the ''
Jovians The Jovians ( la, Ioviani) and Herculians (Latin: ''Herculiani'') were the senior palatine imperial guard units under the rule of Roman Emperor Diocletian (r. 284–305). They continued in existence thereafter as senior units in the field armies ...
'') ** V ''Parthica'' * Legio VI ** VI ''Gemella'' ** VI ''Gallicana'' ** VI ''Herculia'' (maybe the
Herculians The Jovians ( la, Ioviani) and Herculians (Latin: ''Herculiani'') were the senior palatine imperial guard units under the rule of Roman Emperor Diocletian (r. 284–305). They continued in existence thereafter as senior units in the field armies ...
) ** VI ''Hispana'' ** VI ''Parthica'' * Legio XII ** XII ''Victrix''


See also

*
List of Roman auxiliary regiments This article lists ', non-legionary auxiliary regiments of the imperial Roman army, attested in the epigraphic record, by Roman province of deployment during the reign of emperor Hadrian ( AD 117–138). The index of regimental names expla ...
*
Roman army The Roman army (Latin: ) was the armed forces deployed by the Romans throughout the duration of Ancient Rome, from the Roman Kingdom (c. 500 BC) to the Roman Republic (500–31 BC) and the Roman Empire (31 BC–395 AD), and its medieval contin ...
*
Auxilia The (, lit. "auxiliaries") were introduced as non-citizen troops attached to the citizen legions by Augustus after his reorganisation of the Imperial Roman army from 30 BC. By the 2nd century, the Auxilia contained the same number of inf ...
*
Roman legion The Roman legion ( la, legiō, ) was the largest military unit of the Roman army, composed of 5,200 infantry and 300 equites (cavalry) in the period of the Roman Republic (509 BC–27 BC) and of 5,600 infantry and 200 auxilia in the period of ...
* Structural history of the Roman military


Notes


References


Primary sources

* ''
Notitia Dignitatum The ''Notitia Dignitatum'' (Latin for "The List of Offices") is a document of the late Roman Empire that details the administrative organization of the Western and the Eastern Roman Empire. It is unique as one of very few surviving documents of ...
'' reports the military units and their locations at the beginning of the 5th century.


Secondary sources

* ''
Oxford Classical Dictionary The ''Oxford Classical Dictionary'' (''OCD'') is generally considered "the best one-volume dictionary on antiquity," an encyclopædic work in English consisting of articles relating to classical antiquity and its civilizations. It was first pub ...
'' * Keppie, Lawrence. ''The Making of the Roman Army'', 1984 pp. 205–215 *Stephen Dando-Collins "Legions Of Rome"


External links


Legio X
– Legio X Gemina (Equites) – "Viri Clarissimi"




Legio V Living History Group in Tennessee

Roman legions from Dacia (KML file)
{{DEFAULTSORT:List Of Roman Legions Roman legionary fortresses