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Document detailing the administrative organisation of the Eastern and Western Roman Empires
Page from a medieval copy of the Notitia Dignitatum commissioned in 1436 by Pietro Donato, depicting shields of Magister Militum Praesentalis II, a late Roman register of military commands. Bodleian Library, Oxford.
The Notitia Dignitatum (Latin for "The List of Offices") is a document of the lateRoman 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 (nor is its author named), and omissions complicate ascertaining its date from its content.
Copies of the manuscript
There are several extant 15th- and 16th-century copies of the document, plus a colour-illuminated iteration of 1542. All the known, extant copies are derived, either directly or indirectly, from Codex Spirensis, a codex known to have existed in the library of the Chapter of Speyer Cathedral in 1542, but which was lost before 1672 and has not been rediscovered. The Codex Spirensis was a collection of documents, of which the Notitia was the final and largest document, occupying 164 pages, that brought together several previous documents of which one was of the 9th century. The heraldry in illuminated manuscript copies of the Notitia is thought to copy or imitate only that illustrated in the lost Codex Spirensis.
For each half of the Empire, the Notitia enumerates all the major "dignities", i. e. offices, that it could bestow, often with the location and specific officium ("staff") enumerated, except for the most junior members, for each. The dignities are ordered by:
The Notitia presents four primary problems as a source for the Empire's army:
The Notitia depicts the Roman army at the end of the AD 4th century. Therefore, its development from the structure of the Principate is largely conjectural because of the lack of other evidence.
It was compiled at two different times. The section for the Eastern Empire apparently dates from circa AD 395 and that for the Western Empire from circa AD 420. Further, each section is probably not a contemporaneous "snapshot", but relies on data pre-dating it by as many as 20 years. The Eastern section may contain data from as early as AD 379, the beginning of the reign of Emperor Theodosius I. The Western section contains data from as early as circa AD 400: for example, it shows units deployed in Britannia, which must date from before 410, when the Empire lost the island. In consequence, there is substantial duplication, with the same unit often listed under different commands. It is impossible to ascertain whether these were detachments of the same unit in different places simultaneously, or the same whole unit at different times. Also, it is likely that some units were merely nominal or minimally staffed. According to Roger Collins, the Notitia Dignitatum was an archaising text written circa AD 425, whose unreliability is demonstrated by "the supposed existence of traditional (Roman military) units in Britain and Spain at a time when other evidence shows they were not there."
The Notitia has many sections missing and lacunae within sections. This is doubtless due to accumulated textual losses and copying errors, because it was repeatedly copied over the centuries: the earliest manuscript possessed today dates from the 15th century. The Notitia cannot therefore provide a comprehensive list of all units that existed.
The Notitia does not record the number of personnel. Given that and the paucity of other evidence of unit sizes at that time, the size of individual units and the various commands cannot be ascertained. In turn, this makes it impossible to assess accurately the total size of the army. Depending on the strength of units, the late AD 4th century army may, at one extreme, have equalled the size of the AD 2nd century force, i. e., over 400,000 men; and at the other extreme, it may have been far smaller. For example, the forces deployed in Britain circa AD 400 may have been merely 18,000 against circa 55,000 in the AD 2nd century.
The Notitia contains symbols similar to the diagram which later came to be known as yin and yang symbol. The infantry units armigeri defensores seniores ("shield-bearers") and Mauri Osismiaci had a shield design which corresponds to the dynamic, clockwise version of the symbol, albeit with red dots, instead of dots of the opposite colour. The emblem of the Thebaei, another Western Roman infantry regiment, featured a pattern of concentric circles comparable to its static version. The Roman patterns predate the earliest Taoist versions by almost seven hundred years, and there is no evidence for a relation between the two.
^ abIsabelle Robinet: "Taiji tu. Diagram of the Great Ultimate", in: Fabrizio Pregadio (ed.): The Encyclopedia of Taoism A-Z, Routledge, Abingdon (Oxfordshire) 2008, ISBN978-0-7007-1200-7, pp. 934-936 (934)
^ abHelmut Nickel: "The Dragon and the Pearl", Metropolitan Museum Journal, Bd. 26 (1991), S. 146, Fn. 5
Sources and references
Notitia Dignitatum, edited by Robert Ireland, in British Archaeological Reports, International Series 63.2.
Westermann Großer Atlas zur Weltgeschichte contains many precise maps
Klaus-Peter Johne, 'Notitia dignitatum', in: Der Neue Pauly 8 (2000), 1011-1013
A. H. M. Jones, The Later Roman Empire, 284-602. A Social, Economic and Administrative Survey, The Johns Hopkins University Press, 1986, ISBN0-8018-3285-3