The Notitia Dignitatum 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 Roman government, and describes several thousand offices from the imperial court to provincial governments, diplomatic missions, and army units. It is usually considered to be accurate for the Western Roman Empire in the AD 420s and for the Eastern or Byzantine Empire in the AD 390s. However, the text itself is not dated, and omissions complicate ascertaining its date from its content.
Vicarius is a Latin word, meaning substitute or deputy. It is the root of the English word "vicar".
Comes, plural comites, was a Roman title or office, and the origin Latin form of the medieval and modern title "count".
The limitanei, 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.
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 late republic.
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.
Auxilia palatina were infantry units of the Late Roman army, first raised by Constantine I as part of the new field army he created in about 325 AD.
The Scholae Palatinae were an elite military imperial 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. The Scholae survived in Roman and later Byzantine service until they disappeared from the historical record in the late 11th century, during the reign of Alexios I Komnenos.
The Taifals or Tayfals were a people group of Germanic or Sarmatian origin, first documented north of the lower Danube in the mid third century AD. They experienced an unsettled and fragmented history, for the most part in association with various Gothic peoples, and alternately fighting against or for the Romans. In the late fourth century some Taifali were settled within the Roman Empire, notably in western Gaul in the modern province of Poitou. They subsequently supplied mounted units to the Roman army and continued to be a significant source of cavalry for early Merovingian armies. By the sixth century their region of western Gaul had acquired a distinct identity as Thifalia.
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.
Cohors quarta Gallorum equitata was a Roman auxiliary cohort containing both infantry and cavalry contingents. It was probably raised in Gallia Lugdunensis at the time of the founder-emperor Augustus. It is first attested in Moesia in 75 AD and was still in Moesia Inferior in 105. It therefore probably took part in the emperor Trajan's Dacian Wars (99–106). After a brief stay in Thracia, it was transferred to Britannia not later than 122. Its last datable attestation is in 276-82 at Vindolanda. But the Notitia Dignitatum, a late Roman official document, records a cohors IV Gallorum at Vindolanda under the dux Britanniarum, the commander of limitanei along Hadrian's Wall. The Western section of the Notitia was drawn up in the 420's but the British units must date to before 410, when the island was evacuated by the Roman army.
Cohors secunda Delmatarum was a Roman auxiliary infantry regiment.
Equites cataphractarii, or simply cataphractarii, were the most heavily armoured type of Roman cavalry in the Imperial Roman army and Late Roman army. The term derives from a Greek word, κατάφρακτος kataphraktos, meaning "covered over" or "completely covered".
The Primani was a legio palatina of the Late Roman army, active in the 4th and 5th century.
The Cornuti ("horned") was an auxilia palatina unit of the Late Roman army, active in the 4th and 5th century. It was probably related to the Cornuti seniores and the Cornuti iuniores.
The Regii or Reges was a Germanic auxilia palatina unit of the Late Roman army, active between the 4th and the 5th century. There was also a legio comitatensis with the same name. The Regii had its main period of action in the mid-4th century when they were recruited to fight against the Alamannic incursions and invasions of the Roman Empire. Most likely the Regii themselves were composed of Alamannic or Suebi recruits, and were recruited for their extensive knowledge and familiarity with the Suebic Alamanni and their allies.
The equites stablesiani were a class of cavalry in the Late Roman army. They were one of several categories of cavalry unit or vexillatio created between the 260s and 290s as part of a reorganization and expansion of Roman cavalry forces initiated during the reign of Gallienus. These new cavalry vexillationes typically shared the basic regimental designation equites, and included equites Dalmatae, equites Mauri and equites scutarii.
Cohors prima Ulpia Dacorum was an infantry regiment of the Auxilia corps of the Imperial Roman army. It was founded by the Roman emperor Trajan, probably in preparation for his planned war against Parthia (113-6). The regiment's honorific title Ulpia refers to the emperor's gens, or clan-name.
