List of Roman Emperors

List Of Roman Emperors

The title of Roman Emperor, although in some ways a modern concept, effectively summarises the position held by those individuals who wielded power in the Roman Empire. The Roman Empire developed from the Roman Republic after its ascent to the dominant power in Europe, and is characterised by the concentration of power in one individual, rather than the "Senate and People of Rome". However, Augustus, universally accepted to have been the first emperor, was careful to maintain the facade of republican rule, and took no specific title to mark his rule (which began in 27 BC). Instead, he simply concentrated the pre-existing powers of Roman magistrates upon his own person, taking the existing honorific of 'Princeps Senatus' (the first man of the senate). This style of government, which lasted for nearly 300 years, is thus called the 'Principate'. The modern word 'emperor' derives from the title 'Imperator', which was granted by an army to a successful general; as such, during the initial phase of the Roman Empire, it still had to be earned by the 'Princeps'. The term 'emperor', though modern, is used when describing rulers of the Roman Empire, since (a) it emphasises the strong links between the ruler and the army (on whose support the ruler's power depended), and (b) does not discriminate between the style of rule in different phases of the Empire.

In the late 3rd century AD, after the Crisis of the Third Century, Diocletian formalised and embellished the recent manner of imperial rule, establishing the so-called 'Dominate' period of the Roman Empire. This was characterised by the explicit investment of authority in the person of the Emperor, and the use of the style 'Dominus Noster' ('Our Lord'). From Diocletian onwards, there were often multiple simultaneous emperors, dividing the rule of the vast territories between them. After 395 AD, and the death of Theodosius I, the Empire became more firmly split into Western and Eastern halves They were not legally separate however, and the Emperor of the more stable Eastern Empire often imposed his authority over the Western half. The Western Empire was heavily troubled after 395 AD, and collapsed completely after 455 AD, the last Western Emperor abdicating in 476 AD; after which the Emperor in Constantinople ruled without partner and maintained claim to the territories in the west. The Empire would continue until 1453, and the capture of Constantinople by the Ottoman Turks. Later Emperors in the east have been called Byzantine Emperors by Western scholars since at least the 18th century, but were considered by themselves and their contemporaries to continue an unbroken succession of Roman Emperors. The listing of the Eastern Emperors in this article ends at the start of the 7th century with Maurice, last of the Justinian dynasty, and the last Emperor whose Empire still bore a strong resemblance to the Roman Empire of previous centuries and whose reign concludes the final era of Late Antiquity.

The emperors listed in this article are those generally agreed to have been 'legitimate' emperors (e.g. not usurpers, etc.). However, since the emperorship was rather vaguely defined legally, which persons were 'legitimate' is not easy to define; many of the 'legitimate' emperors accessed to the position by usurpation, and many 'illegitimate' claimants had a legitimate claim to the position. The following criteria can be used to derive the list:

• Any individual who undisputedly ruled the whole Empire, at some point, must, in point of fact, be a 'legitimate emperor'(1).
• Any individual who was nominated as heir or co-emperor by a legitimate emperor (1), and who succeeded to rule in his own right, is a legitimate emperor (2).
• Where there were multiple claimants, and none were legitimate heirs, the claimant accepted by the Roman Senate as emperor is the legitimate emperor (3), at least during the Principate.

So for instance, Aurelian, though acceding to the throne by usurpation, was the sole and undisputed monarch between 274–275 AD, and thus was a legitimate emperor. Gallienus, though not in control of the whole Empire, and plagued by other claimants, was the legitimate heir of (the legitimate emperor) Valerian. Claudius Gothicus, though acceding illegally, and not in control of the whole Empire, was the only claimant accepted by the Senate, and thus, for his reign, was the legitimate emperor. Equally, during the Year of the Four Emperors, all claimants, though not undisputed, were at some point accepted by the Senate and are thus included; conversely, during the Year of the Five Emperors neither Pescennius Niger nor Clodius Albinus were accepted by the Senate, and are thus not included. There are a few examples where individuals were made co-emperor, but never wielded power in their own right (typically the child of an emperor); these are legitimate, but are listed together with the 'senior' emperor.

The above formula holds until 395, when the Western and Eastern halves of the Empire split. After that, it continues to hold, with the caveat that a legitimate emperor had undisputed control over one half of the Empire. Towards the end of the Western Empire (after 455), the Western emperor ceased to be a relevant figure and there was sometimes actually no claimant. For the sake of historical completeness, all Western Emperors after that point are included. For instance, Romulus Augustus was technically a usurper who ruled only the Italian peninsula and was never legally recognized. However, he was traditionally considered the "last Roman Emperor" by 18th and 19th century western scholars and his overthrow by Odoacer used as the marking point between historical epochs. However, modern scholarship has confirmed that Romulus Augustus' predecessor, Julius Nepos continued to rule as Emperor in the other Western holdings and as a figurehead for Odoacer's rule in Italy until Nepos' death in 480. Since the question of what constitutes an emperor can be ambiguous, and dating the "fall of the Western Empire" arbitrary, this list includes details of both figures.