East Roman army
Encyclopedia
The East Roman army refers to the army of the Eastern section of the Roman Empire
Roman Empire
The Roman Empire was the post-Republican period of the ancient Roman civilization, characterised by an autocratic form of government and large territorial holdings in Europe and around the Mediterranean....

, from the empire's definitive split in 395 AD to the army's reorganization by themes after the permanent loss of Syria
Syria
Syria , officially the Syrian Arab Republic , is a country in Western Asia, bordering Lebanon and the Mediterranean Sea to the West, Turkey to the north, Iraq to the east, Jordan to the south, and Israel to the southwest....

, Palestine
Palestine
Palestine is a conventional name, among others, used to describe the geographic region between the Mediterranean Sea and the Jordan River, and various adjoining lands....

 and Egypt
Egypt
Egypt , officially the Arab Republic of Egypt, Arabic: , is a country mainly in North Africa, with the Sinai Peninsula forming a land bridge in Southwest Asia. Egypt is thus a transcontinental country, and a major power in Africa, the Mediterranean Basin, the Middle East and the Muslim world...

 to the Arabs in the 7th century (during the Byzantine-Arab Wars
Byzantine-Arab Wars
The Byzantine–Arab Wars were a series of wars between the Arab Caliphates and the East Roman or Byzantine Empire between the 7th and 12th centuries AD. These started during the initial Muslim conquests under the expansionist Rashidun and Umayyad caliphs and continued in the form of an enduring...

). The East Roman army is thus the intermediate phase between the Late Roman army
Late Roman army
The Late Roman army is the term used to denote the military forces of the Roman Empire from the accession of Emperor Diocletian in 284 until the Empire's definitive division into Eastern and Western halves in 395. A few decades afterwards, the Western army disintegrated as the Western empire...

 of the 4th century and the Byzantine army
Byzantine army
The Byzantine army was the primary military body of the Byzantine armed forces, serving alongside the Byzantine navy. A direct descendant of the Roman army, the Byzantine army maintained a similar level of discipline, strategic prowess and organization...

 of the 7th century onwards.

The Roman Army of the 4th century, both Eastern and Western, is described in detail in the article Late Roman army
Late Roman army
The Late Roman army is the term used to denote the military forces of the Roman Empire from the accession of Emperor Diocletian in 284 until the Empire's definitive division into Eastern and Western halves in 395. A few decades afterwards, the Western army disintegrated as the Western empire...

. In its essential features, the East Roman army's organisation remained similar to the 4th century configuration. This article focuses on changes to that configuration during the 5th and 6th centuries.

Sources

Much of our evidence for the East Roman army's deployments at the end of the 4th century is contained in a single document, the Notitia Dignitatum
Notitia Dignitatum
The Notitia Dignitatum is a unique document of the Roman imperial chanceries. One of the very few surviving documents of Roman government, it details the administrative organisation of the eastern and western empires, listing several thousand offices from the imperial court down to the provincial...

, compiled c395-420, a manual of all late Roman public offices, military and civil. The main deficiency with the Notitia is that it lacks any personnel figures so as to render estimates of army size impossible. However, the Notitia remains the central source on the late Army's structure due to the dearth of other evidence.

The bulk of the evidence for the East Roman army is from the period of emperor Justinian I
Justinian I
Justinian I ; , ; 483– 13 or 14 November 565), commonly known as Justinian the Great, was Byzantine Emperor from 527 to 565. During his reign, Justinian sought to revive the Empire's greatness and reconquer the lost western half of the classical Roman Empire.One of the most important figures of...

 (reigned 527-65), who undertook a major programme to reconquer the lost territories of the fallen Western Roman Empire
Western Roman Empire
The Western Roman Empire was the western half of the Roman Empire after its division by Diocletian in 285; the other half of the Roman Empire was the Eastern Roman Empire, commonly referred to today as the Byzantine Empire....

, which had collapsed in 476AD and been replaced by barbarian successor kingdoms. Justinian succeeded in recapturing Italy, Africa and southern Spain. These wars, and the career of Justinian's generalissimo, Belisarius
Belisarius
Flavius Belisarius was a general of the Byzantine Empire. He was instrumental to Emperor Justinian's ambitious project of reconquering much of the Mediterranean territory of the former Western Roman Empire, which had been lost less than a century previously....

, are described in detail by the 6th century historian Procopius
Procopius
Procopius of Caesarea was a prominent Byzantine scholar from Palestine. Accompanying the general Belisarius in the wars of the Emperor Justinian I, he became the principal historian of the 6th century, writing the Wars of Justinian, the Buildings of Justinian and the celebrated Secret History...

.

The third major source for the East Roman army are the legal codes published in the East Roman empire in the 5th and 6th centuries: the Theodosian code (438) and the Corpus Iuris Civilis (528-39). These compilations of Roman laws dating from the 4th century contain numerous imperial decrees relating to all aspects of the regulation and administration of the late army.

Background

In 395, the death of the last unitary Roman emperor, Theodosius I
Theodosius I
Theodosius I , also known as Theodosius the Great, was Roman Emperor from 379 to 395. Theodosius was the last emperor to rule over both the eastern and the western halves of the Roman Empire. During his reign, the Goths secured control of Illyricum after the Gothic War, establishing their homeland...

 (r. 379-95), led to the final split of the empire into two political entities, the West (Occidentale) and the East (Orientale). The system of dual emperors (called Augusti after the founder of the empire, Augustus
Augustus
Augustus ;23 September 63 BC – 19 August AD 14) is considered the first emperor of the Roman Empire, which he ruled alone from 27 BC until his death in 14 AD.The dates of his rule are contemporary dates; Augustus lived under two calendars, the Roman Republican until 45 BC, and the Julian...

) had been instituted a century earlier by the great reforming emperor Diocletian
Diocletian
Diocletian |latinized]] upon his accession to Diocletian . c. 22 December 244  – 3 December 311), was a Roman Emperor from 284 to 305....

 (r.284-305). But it had never been envisaged as a political separation, purely as an administrative and military convenience. Decrees issued by either emperor were valid in both halves and the successor of each Augustus required the recognition of the other. The empire was reunited in single hands twice: under Constantine I
Constantine I
Constantine the Great , also known as Constantine I or Saint Constantine, was Roman Emperor from 306 to 337. Well known for being the first Roman emperor to convert to Christianity, Constantine and co-Emperor Licinius issued the Edict of Milan in 313, which proclaimed religious tolerance of all...

 (r. 312-37) and Theodosius himself.

But the division into two sections recognized a growing cultural divergence. The common language of the East had always been Greek
Ancient Greek
Ancient Greek is the stage of the Greek language in the periods spanning the times c. 9th–6th centuries BC, , c. 5th–4th centuries BC , and the c. 3rd century BC – 6th century AD of ancient Greece and the ancient world; being predated in the 2nd millennium BC by Mycenaean Greek...

, while the West was Latin
Latin
Latin is an Italic language originally spoken in Latium and Ancient Rome. It, along with most European languages, is a descendant of the ancient Proto-Indo-European language. Although it is considered a dead language, a number of scholars and members of the Christian clergy speak it fluently, and...

-speaking. This was not per se a significant division, as the empire had long been a fusion of Greek and Roman cultures (classical civilisation) and the Roman ruling class was entirely bilingual. But the rise of Christianity
Christianity
Christianity is a monotheistic religion based on the life and teachings of Jesus as presented in canonical gospels and other New Testament writings...

 strained that unity, as the cult was always much more widespread in the East than in the West, which was still largely pagan in 395. Constantine's massive construction of the city of Byzantium
Byzantium
Byzantium was an ancient Greek city, founded by Greek colonists from Megara in 667 BC and named after their king Byzas . The name Byzantium is a Latinization of the original name Byzantion...

 as a second capital to rival Rome led to the establishment of a separate eastern court and bureaucracy.

Finally, the political split became complete with the collapse of the Western empire
Western Roman Empire
The Western Roman Empire was the western half of the Roman Empire after its division by Diocletian in 285; the other half of the Roman Empire was the Eastern Roman Empire, commonly referred to today as the Byzantine Empire....

 in the early 5th century and its replacement by a number of barbarian Germanic kingdoms. The Western army was dissolved and was incorporated into the barbaric kingdoms. The Eastern empire and army, on the other hand, continued intact until the Arab invasions in the 7th century. These deprived the East Roman empire of its dominions in the Middle East and North Africa, especially Egypt.

Numbers

The size of the Eastern army in 395 is controversial because the size of individual regiments is not known with any certainty. Plausible estimates of the size of the whole 4th century army (excluding fleets) range from c400,000 to c600,000. This would place the Eastern army in the rough range 200,000 to 300,000, since the army of each division of the empire was roughly equal.

The higher end of the range is provided by the late 6th century military historian Agathias
Agathias
Agathias or Agathias Scholasticus , of Myrina , an Aeolian city in western Asia Minor , was a Greek poet and the principal historian of part of the reign of the Roman emperor Justinian I between 552 and 558....

, who gives a global total of 645,000 effectives for the army "in the old days", presumed to mean when the empire was united. This figure probably includes fleets, giving a total of c600,000 for the army alone. Agathias is supported by A.H.M. Jones' Later Roman Empire (1964), which contains the fundamental study of the late Roman army. Jones calculated a similar total of 600,000 (exc. fleets) by applying his own estimates of unit strength to the units listed in the Notitia Dignitatum. Following Jones, Treadgold suggests 300,000 for the East in 395.

But there are strong reasons to view 200,000 as more likely:
  1. Jones' assumptions about unit strengths, based on papyri evidence from Egypt, are probably too high. A rigorous reassessment of the evidence by R. Duncan-Jones concluded that Jones had overestimated unit sizes by 2-5 times.
  2. The evidence is that regiments were typically one-third understrength in the 4th century. Thus Agathias' 600,000 on paper (if it is based on official figures at all) may in reality have translated into only 400,000 actual troops on the ground.
  3. Agathias gives a figure of 150,000 for the army in his own time (late 6th c.) which is more likely to be accurate than his figures for the 4th century. If Agathias' 4th c. and 6th c. figures are taken together, they would imply that Justinian's empire was defended by only half the troops that supposedly defended the earlier empire, despite having to cover even more territory (the reconquered provinces of Italy, Africa and S. Spain), which seems inherently unlikely.


The discrepancy in army size estimates is mainly due to uncertainty about the size of limitanei regiments, as can be seen by the wide range of estimates in the table below. Jones suggests limitanei regiments had a similar size to Principate auxilia regiments, averaging 500 men each. More recent work, which includes new archaeological evidence, tends to the view that units were much smaller, perhaps averaging 250.

There is less dispute about comitatus regiments, because of more evidence. Treadgold estimates the 5 comitatus armies of the East as containing c20,000 men each, for a total of c100,000, which constitutes either one-third or one-half of the total army.

About one third of the army units in the Notitia are cavalry, but cavalry numbers were less than that proportion of the total because cavalry unit sizes were smaller. The available evidence suggests that the proportion of cavalry was about one-fifth of the total effectives: in 478, a comitatus of 38,000 men contained 8,000 cavalry (21%).

Command structure

The later 4th century army contained three types of army group: (1) Imperial escort armies (comitatus praesentales). These were ordinarily based near Constantinople, but often accompanied the emperors on campaign. (2) Regional armies (comitatus). These were based in strategic regions, on or near the frontiers. (3) Border armies (exercitus limitanei). These were based on the frontiers themselves.

The command structure of the Eastern army, as recorded in the Notitia Dignitatum, is represented diagramatically in the organisation chart (above).

By the end of the 4th century, there were 2 comitatus praesentales in the East. They wintered near Constantinople at Nicaea and Nicomedia. Each was commanded by a magister militum
Magister militum
Magister militum was a top-level military command used in the later Roman Empire, dating from the reign of Constantine. Used alone, the term referred to the senior military officer of the Empire...

("master of soldiers", the highest military rank) Each magister was assisted by a deputy called a vicarius.

There were 3 major regional comitatus, also with apparently settled winter bases: Oriens (based at Antioch
Antioch
Antioch on the Orontes was an ancient city on the eastern side of the Orontes River. It is near the modern city of Antakya, Turkey.Founded near the end of the 4th century BC by Seleucus I Nicator, one of Alexander the Great's generals, Antioch eventually rivaled Alexandria as the chief city of the...

), Thraciae (Marcianopolis
Marcianopolis
Marcianopolis or Marcianople was an ancient Roman city in Thracia. It was located at the site of modern day Devnya, Bulgaria.-History:...

), Illyricum (Sirmium) plus two smaller forces in Aegyptus (Alexandria) and Isauria
Isauria
Isauria , in ancient geography, is a rugged isolated district in the interior of South Asia Minor, of very different extent at different periods, but generally covering what is now the district of Bozkır and its surroundings in the Konya province of Turkey, or the core of the Taurus Mountains. In...

. The large comitatus were commanded by magistri, the smaller ones by comites. All five reported direct to the eastern Augustus. This structure remained essentially intact until the 6th century.

Regiments

Regiments were classified according to whether they were attached to the comitatus armies (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...

) or border forces (limitanei
Limitanei
The limitanei, meaning "the soldiers in frontier districts" The limitanei, meaning "the soldiers in frontier districts" The limitanei, meaning "the soldiers in frontier districts" (from the Latin phrase limes, denoting the military districts of the frontier provinces established in the late third...

). Of the comitatenses regiments, about half were palatini
Palatini (Roman military)
The palatini were elite regiments of the Late Roman army mostly attached to the comitatus praesentales, or imperial escort armies...

(literally: "of the palace"), an elite grade.

The strength of army regiments is very uncertain and may have varied over the 5th/6th centuries. Size may also have varied depending on the grade of the regiment. The table below gives some recent estimates of unit strength, by unit type and grade:
ESTIMATED SIZE OF REGIMENTS IN 4th CENTURY ARMY
! Cavalry
unit type !! Comitatenses
(inc. palatini) !! Limitanei !! XXXXX !! Infantry
unit type !! Comitatenses
(inc. palatini) !! Limitanei
Ala 120-500 Auxilia 800-1,200 or 400-600 400-600
Cuneus 200-300 Cohors 160-500
Equites 80-300 Legio 800-1,200 500
Schola 500 Milites 200-300
Vexillatio 400-600 Numerus 200-300

The overall picture is that comitatenses units were either c1,000 or c500 strong. Limitanei units would appear to average about 250 effectives. But much uncertainty remains, especially regarding the size of limitanei regiments, as can be seen by the wide ranges of the size estimates.

Scholae

The Scholae Palatinae
Scholae Palatinae
The Scholae Palatinae , were an elite military guard unit, usually ascribed to the Roman Emperor Constantine the Great as a replacement for the equites singulares Augusti, the cavalry arm of the Praetorian Guard...

were elite cavalry regiments that acted as imperial escorts. At the end of the 4th c., there were 7 scholae (3,500 men) in the East. They were outside the normal military chain of command as they did not belong to the comitatus praesentales and reported to the magister officiorum, a civilian official. However, this was probably only for administrative purposes: on campaign, the tribunes (regimental commanders) of the scholae probably reported direct to the emperor himself. 40 select troops from the scholae, called candidati from their white uniforms, acted as the emperor's personal bodyguards.

Comitatenses

Comitatenses cavalry regiments were known as vexillationes, infantry regiments as either legiones or auxilia. About half the regiments in the comitatus, both cavalry and infantry, were classified as palatini. They were concentrated in the comitatus praesentales (80% of regiments) and constituted a minority of the regional comitatus (14%). The palatini were an elite group with higher status and probably pay.

The majority of cavalry regiments in the comitatus were traditional melee formations (61%). These regiments were denoted scutarii, stablesiani or promoti, probably honorific titles rather than descriptions of function. 24% of regiments were light cavalry: equites Dalmatae, Mauri and sagittarii (mounted archers). 15% were heavily armoured shock charge cavalry: cataphracti and clibanarii
Clibanarii
The Clibanarii or Klibanophoroi were a Sassanid Persian, late Roman and Byzantine military unit of heavy armored horsemen. Similar to the cataphracti, the horsemen themselves and their horses were fully armoured...



Limitanei

In the limitanei, most types of regiment are present, including the old-style alae and cohortes of the Principate auxilia.

Recruitment

In 395, the army used Latin as its operating language. This continued to be the case into the late 6th century, despite the fact that Greek was the common language of the Eastern empire. This was not simply due to tradition, but also to the fact that about half the Eastern army continued to be recruited in the Latin-speaking Danubian regions of the Eastern empire. An analysis of known origins of comitatenses in the period 350-476 shows that in the Eastern army, the Danubian regions provided 54% of the total sample, despite constituting just 2 of the 7 eastern dioceses
Roman diocese
A Roman or civil diocese was one of the administrative divisions of the later Roman Empire, starting with the Tetrarchy. It formed the intermediate level of government, grouping several provinces and being in turn subordinated to a praetorian prefecture....

 (administrative divisions): Dacia and Thracia. These regions continued to be the prime recruiting grounds for the East Roman army e.g. the emperor Justin I
Justin I
Justin I was Byzantine Emperor from 518 to 527. He rose through the ranks of the army and ultimately became its Emperor, in spite of the fact he was illiterate and almost 70 years old at the time of accession...

 (r. 518-27), uncle of Justinian I, was a Latin-speaking peasant who never learnt to speak more than rudimentary Greek. The Romanized Thracian
Thracians
The ancient Thracians were a group of Indo-European tribes inhabiting areas including Thrace in Southeastern Europe. They spoke the Thracian language – a scarcely attested branch of the Indo-European language family...

 (Thraco-Roman
Thraco-Roman
The terms Thraco-Roman and Daco-Roman refer to the culture and language of the Thracian and Dacian peoples who were incorporated into the Roman Empire and ultimately fell under the Roman and Latin sphere of influence.-Meaning and usage:...

) and Illyrian
Illyrians
The Illyrians were a group of tribes who inhabited part of the western Balkans in antiquity and the south-eastern coasts of the Italian peninsula...

 inhabitants of those regions, who came to be known as Vlachs
Vlachs
Vlach is a blanket term covering several modern Latin peoples descending from the Latinised population in Central, Eastern and Southeastern Europe. English variations on the name include: Walla, Wlachs, Wallachs, Vlahs, Olahs or Ulahs...

 by foreigners in the Middle Ages
Middle Ages
The Middle Ages is a periodization of European history from the 5th century to the 15th century. The Middle Ages follows the fall of the Western Roman Empire in 476 and precedes the Early Modern Era. It is the middle period of a three-period division of Western history: Classic, Medieval and Modern...

, retained the Roman name (Romanians
Romanians
The Romanians are an ethnic group native to Romania, who speak Romanian; they are the majority inhabitants of Romania....

) and the Latin tongue.

See also

  • Late Roman army
    Late Roman army
    The Late Roman army is the term used to denote the military forces of the Roman Empire from the accession of Emperor Diocletian in 284 until the Empire's definitive division into Eastern and Western halves in 395. A few decades afterwards, the Western army disintegrated as the Western empire...

  • Roman army
    Roman army
    The Roman army is the generic term for the terrestrial armed forces deployed by the kingdom of Rome , the Roman Republic , the Roman Empire and its successor, the Byzantine empire...

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