/duy'euh klee"sheuhn/, n. (Gaius Aurelius Valerius Diocletianus)
A.D. 245-316, Illyrian soldier: emperor of Rome 284-305.

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Latin Gaius Aurelius Valerius Diocletianus orig. Diocles

born AD 245, Salonae?, Dalmatia
died 316, Salonae

Roman emperor (284–305).

He was serving under the emperor Carinus (r. 283–285) when the co-emperor, Carinus's brother Numerian, was killed. Diocletian's army declared him emperor, but his domain was restricted to Asia Minor and possibly Syria. Carinus attacked Diocletian (285) but was assassinated before achieving victory, allowing Diocletian to become sole emperor. He sought to remove the military from politics and established a tetrarchy (four-ruler system) to spread his influence and combat rebellions throughout the empire. Proclaiming himself and his corulers as gods, he added the trappings of a theocracy to the reign. His fiscal, administrative, and military reorganization laid the foundation for the Byzantine empire in the east and briefly strengthened the fading empire in the west. In 303–304 he issued four edicts decreeing the last great persecution of Christians. He abdicated in 305.

Diocletian, detail of a bust in the Capitoline Museum, Rome.

Alinari/Art Resource, New York

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▪ Roman emperor
Latin in full  Gaius Aurelius Valerius Diocletianus , original name  Diocles 
born AD 245 , Salonae?, Dalmatia [now Solin, Croatia]
died 316, Salonae
 Roman (ancient Rome) emperor (284–305), who restored efficient government to the empire after the near anarchy of the 3rd century. His reorganization of the fiscal, administrative, and military machinery of the empire laid the foundation for the Byzantine Empire in the East and temporarily shored up the decaying empire in the West. His reign is also noted for the last great persecution of the Christians.

      Diocletian's biography has been obscured by legends, rhetoric, the dubiousness of documents, and the hostility of his adversaries. Little is known of his origins. His father was a scribe or the emancipated slave of a senator called Anullinus. Diocletian's complete name, found in official inscriptions, is given as Gaius Aurelius Valerius Diocletianus. He received the name Diocles first, then the name Valerius, after the name of his daughter, Valeria, who married Galerius in 293. The gens name Aurelius did not appear until March 1, 286—that is, until after his accession. Nothing is known of his wife, Prisca, other than what the contemporary Latin Christian writer Lactantius Firmianus says in his De mortibus persecutorum, which is of debatable veracity. Diocles, having adopted the name Diocletianus, entered history like so many of those emperors who emerged from the shadows through force of arms, brought to power by the army. What is known of his appearance is based on coin effigies and on sculptures. From these it appears that he was tall and thin, with a large forehead, a short, strong nose, a hard mouth, and a determined chin.

Rise to power
      Up to the time of his accession, Diocletian had lived most of his life in military camps. These may have been either in Gaul, as reported in the Historia Augusta (Augustan History), or in Moesia. Or he may have been a member of the Roman emperor Carinus' (Carinus) bodyguard. The only definite fact known about Diocletian during this period is that he was among those army chiefs whom Carinus gathered, together with the Illyrians, to fight against the Persians. In 284, during that campaign, Numerian, Carinus' brother and coemperor, was found dead in his litter, and his adoptive father, the praetorian prefect Aper, was accused of having killed him in order to seize power. When Diocletian, acclaimed as emperor by his soldiers, appeared for the first time in public dressed in the imperial purple, he declared himself innocent of Numerian's murder. He designated Aper as the criminal and killed him personally. Here again, rhetoric has obscured the real events. Aper's guilt was accepted by contemporaries, but it was also true that a prediction had been made to Diocletian previously, telling him that he would become emperor on the day he killed a boar (Latin: aper). And it was true, too, that he did not wish to wait much longer for the boar to come. In reality, Numerian had died either a natural death or from a stroke of lightning. By eliminating Aper, however, Diocletian rid himself of an eventual competitor and, retroactively, provided his act with sacred meaning.

      Acclaimed emperor on Nov. 17, 284, Diocletian possessed real power only in those countries that were dominated by his army (i.e., in Asia Minor and possibly Syria). The rest of the empire was obedient to Numerian's brother Carinus. After having put down a revolt by Julianus, a troop commander in Pannonia, whom he attacked and killed near Verona, Carinus proceeded to attack Diocletian. An indecisive battle near the confluence of the Margus (modern Morava) and Danube rivers, not far from present-day Belgrade, would have been a defeat for Diocletian had Carinus not been assassinated by a group of soldiers. Thus, in midsummer of 285, Diocletian became master of the empire.

Reorganization of the empire
      At the beginning of 286, Diocletian was in Nicomedia (İzmit). In the interim, he and his lieutenants had calmed the stirrings of revolt among Roman troops stationed on the frontiers. From that point on, he dedicated himself to restoring civil order to the empire by removing the army from politics.

      Although he came from the army's ranks, Diocletian was not, properly speaking, a soldier. He had scarcely come to power when he made an unexpected decision—to share the throne with a colleague of his choice. The empire was too great for one man to administer; nearly every week, either in Africa, or somewhere on the frontier that extended from Britain to the Persian Gulf, along the Rhine, the Danube, the Pontus Euxinus (Black Sea), and the Euphrates, he was forced to suppress a revolt or stop an invasion. Diocletian, who was more attracted to administration, required a man who was both a soldier and a faithful companion to take responsibility for military defense. In 286 he chose Maximian, an Illyrian, the son of a peasant from the area around Sirmium. A little later, though still keeping Rome as the official capital, he chose two other residences. Maximian, who was responsible for the West, was installed at Milan in northern Italy, in order to prevent German invasions. Diocletian established himself at Nicomedia, in western Anatolia and close to the Persian frontier, in order to keep watch on the East. Six years later, in 293, having taken the title of “Augustus” and given it to Maximian as well, he added two more colleagues: Galerius, a former herdsman, and Constantius I Chlorus (Constantius I), a Dardanian nobleman according to the legend of his house, but a rather rude countryman also. These additional collaborators were each given the title “Caesar” and attached to an Augustus, Constantius to Maximian (with a residence in Trier), and Galerius to Diocletian himself (with a residence in Sirmium).

      Thus, while the empire remained a patrimonium indivisum (undivided inheritance), it was nevertheless divided administratively: Diocletian, residing in Nicomedia, watched over Thrace, Asia, and Egypt; Galerius, residing in Sirmium, watched over Illyria, the Danubian provinces, and Achaea; Maximian, residing in Milan, over Italy, Sicily, and Africa; and Constantius I Chlorus, residing in Trier, over Gaul, Spain, and Britain. In order to strengthen the union of the colleagues, each Augustus adopted his Caesar. The relationships were further cemented when Galerius married Valeria, Diocletian's daughter, and Constantius I Chlorus repudiated his wife Helena, mother of the future emperor Constantine, in order to marry Theodora, Maximian's stepdaughter. The empire now had four masters, celebrated by the authors of the Historia Augusta (a collection of biographies of Roman emperors and caesars, published in the 17th century) as the quattuor principes mundi (“four princes of the world”), and Diocletian consecrated this human unity by forming a religious bond. Because he believed that he had come to power through divine will, as revealed by the “fateful” boar, he regarded himself and Maximian as “sons of gods and creators of gods.” After 287, he called himself Jovius (Jove) and Maximian was named Herculius (Hercules), signifying that they had been chosen by the gods and predestined as participants in the divine nature. Thus, they were charged with distributing the benefits of Providence, Diocletian through divine wisdom, and Maximian through heroic energy. Later designated as dominus et deus on coins and inscriptions, Diocletian surrounded himself with pomp and ceremony and regularly manifested his autocratic will. Under Diocletian, the empire took on the aspects of a theocracy.

      Diocletian's reforms were successful; they put an end to domestic anarchy, and elsewhere they allowed Maximian to defeat the revolt in Gaul of the Bagaudae, bands of peasants who found the tribute oppressive. Then, with peace scarcely restored after a campaign against the Germans, Maximian had to battle Carausius (Carausius, Marcus Aurelius Mausaeus), who, having fought for the empire in Britain against the Frankish and Saxon pirates, revolted and named himself emperor in Britain in 287. Carausius reigned in Britain for nearly 10 years until Constantius I Chlorus succeeded in returning Britain to the empire in 296. Scarcely had troubles in Mauretania and in the Danubian regions been settled when Egypt declared itself independent under the usurper Achilleus. Diocletian reconquered the country in 296. Finally, in 297, he had to fight Narses, king of Persia, who had invaded Syria. Since he was still occupied in Egypt, he assigned this operation to Galerius, who, after a protracted campaign, finally won victory for the Romans. Tiridates, the king of Armenia and a protégé of the Romans, was able to return to his throne; the Tigris became the eastern border of the empire; and peace reigned in that part of the world until the reign of Constantine I (306–337).

Domestic reforms
      Perhaps more important for the maintenance of the empire was Diocletian's program of domestic reform. He was not a complete innovator in this area, for his predecessors had made some tentative attempts in the same direction; the emperor Gallienus had excluded senators from the army and separated military from civil careers. The Senate had progressively been deprived of its privileges. Diocletian, however, systematized these arrangements in such a way that all his reforms led toward a kind of centralized and absolute monarchy that put effective means of action at his disposal. Thus, Diocletian designated the consuls (consul); the senators no longer collaborated in the making of laws; the imperial counsellors (consilia sacra) were distributed among specialized offices, and their functions were strictly defined so that the power of the praetorian prefects (prefect) (personal bodyguards to the emperor) was limited; the specialization of administrative work grew; and the number of bureaucrats increased. This was the beginning of the bureaucracy and technocracy that was eventually to overrun modern societies.

      Such organization made it possible for administration to rely less on individual human beings and more on the application of legal texts. In fact, it was during Diocletian's reign that the Gregorian and Hermogenian codes, of which only fragments remain, were rewritten. But 1,200 extant rescripts show another aspect of the Emperor's personality. A conservative, Diocletian was concerned with the preservation of the ancient virtues: the obligation of children to feed their parents in old age; of parents to treat their children justly; of spouses to respect the laws of marriage; of sons not to bear witness against their fathers, or slaves against their masters; and of private property, creditor's rights, and contract clauses to be protected. He forbade the use of torture if truth could be discovered otherwise and encouraged governors to be as autonomous as possible.

      The army was also reorganized and brought back to the old discipline. Sedentary troops (local troops) were sent to the frontiers, and the ready army (main movable army) was made domestic. Troop strength was increased by a fourth, not multiplied by four as Lactantius claims. Here again, Diocletian's reforms were infused with a sense of human realities; he exempted soldiers from duty after 20 years of service, and, if he limited the price of commodities so as to reduce the cost of living, it was mainly to make life easier for the troops. If one is to believe Lactantius, Diocletian divided the provinces “so as to make himself more feared,” but in fact it was to bring the governors closer to those they administered and, by fragmenting their power, to diminish their territorial strength. He undertook to facilitate economic development through a recovery of agriculture and a program of building.

      Such policies were expensive, as were wars and the legacy of an unstable financial situation. Diocletian's fiscal solutions are still debated; they constitute a very difficult problem. Two new taxes (taxation) were instituted, the jugum and the capitatio, the former being the tax on a unit of cultivable land, the latter, a tax on individuals. Taxes were levied on a proportional basis, the amount of the contribution being determined by the productivity and type of cultivation. As a rule, it was a sort of socioeconomic taxation based on the linkage between man and land in terms of either ownership or productivity. Assessments were made every five years; later, the system was consolidated into a cycle (indiction) of 15 years called an indictio. This census of taxable adults gave rise to violent criticisms but had the theoretical advantage of replacing the arbitrary levies of the previous era. To be sure, the financial system was subject to excesses; but Diocletian's purpose was to obtain funds, and he did not even spare Italy, which had until then been free of land taxation.

      This reform was accompanied by a monetary reform, including restoration of a sound gold and silver coinage of fixed design, creation of a new bronze coin, circulation of small coins to facilitate daily financial exchange, decentralization of minting, and an increase in the number of mints from 8 to 15.

      All of these measures tended to stave off financial crises. The renowned Edictum de Maximis Pretiis was issued in AD 301, fixing wages and establishing maximum prices, so as to prevent inflation, abusive profits, and the exploitation of buyers. About 1,000 articles were enumerated, and violation was punishable by death; severe penalties were exacted of black marketeers. But even so, this regulation of prices and wages was not enforceable, and the edict was later revoked.

Persecution of Christians (Christianity)
      The end of the reign was darkened by the last major persecution of the Christians. The reasons for this persecution are uncertain, but various explanations have been advanced: the possible influence of Galerius, a fanatic follower of the traditional Roman religion; the desire to restore complete unity, without tolerance of a foreign cult that was seen as separatist and of men who were forming a kind of state within the state; the influence of anti-Christian philosophers such as Porphyry and governors such as Hierocles on the scholarly class and on the imperial court; the fear of an alienation of rebellious armies from emperor worship; or perhaps the disturbances provoked by the Christians themselves, who were agitated by doctrinal controversies. At any rate, some or all of these factors led Diocletian to publish the four edicts of 303–304, promising all the while that he would not spill blood. His vow went unheeded, however, and the persecutions spread through the empire with an extreme violence that did not succeed in annihilating Christianity but caused the faith of the martyrs to blaze forth instead.

      Diocletian had aged prematurely through illness. Perhaps he decided that, after 20 years of reign, his abdication was also “fateful.” Of his own volition he decided to entrust the affairs of the empire to younger men and returned first to Nicomedia, then to the neighbourhood of Salonae, on the edge of the Adriatic, where he had a magnificent palace built (the modern town of Split, in Yugoslavia, occupies the site of its ruins). He abdicated May 1, 305, and his death occurred almost unnoticed.

      Diocletian had reorganized the empire without political romanticism. His reforms had not proceeded from a premeditated plan but had imposed themselves out of historical necessity. He may be accused of several things: of having been cruel, but his harshness was not the act of deep-seated brutality; of being miserly, but this miserliness was inspired by the desire to obtain resources for the state; of cutting a slightly muddle-headed, visionary figure, but these were the traits that led him to reflect on better methods of governing an immense territory; of having paved the way to bureaucracy and technocracy, but this was done with greater efficiency in view. Personally, Diocletian was a religious man. No doubt he did not manifest any unusual piety, but he always thought that the gods of the emperors governed the world. He exercised an absolute, “divine right” monarchy, and he surrounded it with an almost Oriental majesty.

      Partially he failed in his task, and one can rightly say that the state he created was not “the new house he intended to build, but rather an emergency shelter,” which offered protection against storms with the help of the gods. The fact remains that he was, in his actions, his religion, and his time, vir rei publicae necessarius, “the man whom the State needed.”

Jean Cousin

Additional Reading
Among the general works on the late empire that treat Diocletian extensively are A.H.M. Jones, The Later Roman Empire, 284–602 (1964, reprinted 1986); and Pat Southern, The Roman Empire from Severus to Constantine (2001). Works that present documentary evidence include Simon Corcoran, The Empire of the Tetrarchs (1996); and Roger Rees, Diocletian and the Tetrarchy (2004). More specific treatments of Diocletian are Timothy D. Barnes, The New Empire of Diocletian and Constantine (1982); and Stephen Williams, Diocletian and the Roman Recovery (1985, reprinted 1997).

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Universalium. 2010.

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