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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.
Units such as the Joviani and Herculiani had 5,000 soldiers and 726–800 cavalrymen. Many units' sizes would vary. There were three types of units, the heavy infantry, medium infantry, and light infantry. The comitatenses were the heavy infantry. The auxiliaries, auxilia palatina , and the peltasts were the medium infantry, and the psiloi were the light infantry. Comitatenses regiments consisted of 1,024 soldiers. Comitatenses legions could consist of 6,000 to 7,000 soldiers. Some of these soldiers would be lightly armed, while others would be heavily armed. During a battle the army would divide into 3-4 divisions. The army might use a double phalanx to protect its rear. Reserves would be located behind or between each division. [1]
In the Late Roman Empire the army was divided into two major units, the limitanei border guards and mobile armies consisting of comitatenses. The limitanei would deal with smaller raids, or, in the case of larger invasions, try to defend or stall long enough for the comitatenses legions to arrive. These comitatenses would be grouped into field armies. [2] This strategy has been described as "defense in depth." To conserve manpower, the general would do his best to avoid a pitched battle. Rather than attack the enemy, the legions would form a shield wall and wait for the enemy to attack the Romans. The Romans would use their superior coordination to defeat the enemy. The Emperor would command a comitatenses field army to put down rebellions. [3] [4] [5]
Comitatenses is the Latin nominative plural of comitatensis, an adjective derived from comitatus ('company, party, suite'; in this military context it came to the novel meaning of 'the field army'), itself derived from comes ('companion', but hence specific historical meanings, military and civilian).
However, historically it became the accepted (substantiated) name for those Roman imperial troops (legions and auxiliary) which were not merely garrisoned at a limes (fortified border, on the Rhine and Danube in Europe and near Persia and the desert tribes elsewhere)—the limitanei or ripenses, i.e. "along the shores"—but more mobile line troops; furthermore there were second line troops, named pseudocomitatenses, former limitanei attached to the comitatus; palatini , elite ("palace") units typically assigned to the magister militum ; and the scholae palatinae of actual palace guards, usually under the magister officiorum , a senior court official of the Late Empire.[ citation needed ]
Among the comitatenses units listed by Notitia Dignitatum are:
The Roman legion, the largest military unit of the Roman army, comprised 5,200 infantry and 300 equites (cavalry) in the period of the Roman Republic and 5,600 infantry and 200 auxilia in the period of the Roman Empire.
Legio IV Macedonica, was a legion of the Imperial Roman army founded in 48 BC by Gaius Julius Caesar with Italian legionaries. The legion was disbanded in AD 70 by Emperor Vespasian. The legion symbols were a bull and a capricorn.
Legio V Alaudae, sometimes also known as Gallica, was a legion of the Roman army founded in 52 BC by the general Gaius Julius Caesar. It was levied in Transalpine Gaul to fight the armies of Vercingetorix, and was the first Roman legion to comprise non-citizens. Historians disagree whether the legion was destroyed during the Batavian rebellion in AD 70, or during the First Battle of Tapae.
Legio XIII Gemina, in English the 13th Twin Legion was a legion of the Imperial Roman army. It was one of Julius Caesar's key units in Gaul and in the civil war, and was the legion with which he crossed the Rubicon in January, perhaps the 10th, 49 BC. The legion appears to have still been in existence in the 5th century AD. Its symbol was the lion.
Legio III Italica was a legion of the Imperial Roman army founded in 165 AD by the emperor Marcus Aurelius for his campaign against the Marcomanni tribe. The cognomen Italica suggests that the legion's original recruits were drawn for the defence of Italy. The legion was still active in Raetia and other provinces in the early 5th century.
The līmitāneī, meaning respectively "the soldiers in frontier districts" or "the soldiers on the riverbank", were an important part of the late Roman and early Byzantine army after the reorganizations of the late 3rd and early 4th centuries. The limitanei, unlike the comitātēnsēs, palātīnī, and scholæ, garrisoned fortifications along the borders of the Roman Empire and were not normally expected to fight far from their fortifications.
Legio V Macedonica was a Roman legion. It was probably originally levied in 43 BC by consul Gaius Vibius Pansa Caetronianus and Gaius Iulius Caesar Octavianus. It was based in the Balkan provinces of Macedonia, Moesia and Dacia. In the Notitia Dignitatum records from beginning of the fifth century, the legion was still stationed in Dacia, with detachments stationed in the east and Egypt.
Legio IV Flavia Felix, was a legion of the Imperial Roman army founded in AD 70 by the emperor Vespasian from the cadre of the disbanded Legio IV Macedonica. The legion was active in Moesia Superior in the first half of the 5th century. The legion symbol was a lion.
The Legio II Flavia Constantia was a comitatensis Roman legion, created by Diocletian or Galerius, probably in the years 293, 296 or 297.
The structural history of the Roman military concerns the major transformations in the organization and constitution of ancient Rome's armed forces, "the most effective and long-lived military institution known to history." At the highest level of structure, the forces were split into the Roman army and the Roman navy, although these two branches were less distinct than in many modern national defense forces. Within the top levels of both army and navy, structural changes occurred as a result of both positive military reform and organic structural evolution. These changes can be divided into four distinct phases.
In modern scholarship, the "late" period of the Roman army begins with the accession of the Emperor Diocletian in AD 284, and ends in 480 with the death of Julius Nepos, being roughly coterminous with the Dominate. During the period 395–476, the army of the Roman Empire's western half progressively disintegrated, while its counterpart in the East, known as the East Roman army remained largely intact in size and structure until the reign of Justinian I.
The Eastern Roman army refers to the army of the eastern section of the Roman Empire, from the empire's definitive split in 395 AD to the army's reorganization by themes after the permanent loss of Syria, Palestine and Egypt to the Arabs in the 7th century during the Byzantine-Arab Wars. The East Roman army is the continuation of the Late Roman army of the 4th century until the Byzantine army of the 7th century onwards.
The palatini 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 scholares, but above the comitatenses and the limitanei.
Traianus Mucianus was a Roman soldier of Thracian origins of the second half of the Third Century AD who rose from the lowest ranks of the army to senior commands. He was almost certainly a remarkable soldier. However, the successive promotions he secured in the latter part of his career are thought to owe much also to the favour shown him by men highly placed in the Imperial entourage whose patronage secured him advantageous postings in the Imperial comitatus, the mobile field force under the direct command of the Emperor, that was undergoing massive expansion at this time.
In Roman Dacia, an estimated 50,000 troops were stationed at its height.
By the size of the Roman army is meant the changes in the number of its contingents: legions, auxiliaries, Praetorian cohorts, Urban cohorts, vigiles, and naval forces over the course of twelve centuries – from 753 BC to AD 476.
The Dux Belgicae secundae was a senior officer in the army of the Late Roman Empire who was the commander of the limitanei and of a naval squadron on the so-called Saxon Shore in Gaul.
Legio I Flavia Constantia was a Roman legion, mentioned in the Notitia Dignitatum as a comitatenses unit stationed in the Eastern Empire.