In spite of his failures, Diocletian's reforms fundamentally changed the structure of Roman imperial government and helped stabilize the Empire economically and militarily, enabling the Empire to remain essentially intact for another hundred years despite having seemed near the brink of collapse in Diocletian's youth.

Diocletian's reforms in the region, combined with those of Septimus Severus, brought Egyptian administrative practices much closer to Roman standards.

Diocletian's reforms also increased the number of financial officials in the provinces: more rationales and magistri privatae are attested under Diocletian's reign than before.

Most importantly, Diocletian's tax system and administrative reforms lasted, with some modifications, until the advent of the Muslims in the 630s.

Diocletian's reforms created a strong governmental bureaucracy, reformed taxation, and strengthened the army, which bought the empire time but did not completely resolve the problems it was facing: excessive taxation, a declining birthrate, and pressures on its frontiers amongst others.

Gaining sole reign of the empire, he is also noted for re-establishing a single imperial capital, choosing the site of ancient Byzantium in 330 ( over of the current capitals, which had effectively been changed by Diocletian's reforms to Milan in the West, and Nicomedia in the East ) to build the city soon called Nova Roma ( New Rome ); it was later renamed Constantinople in his honor.

After Diocletian's reforms, the functions of the Prefect embraced a wide sphere ; they were administrative, financial, judicial, and even legislative.

After Diocletian's administrative reforms, it was split into Africa Zeugitana ( which retained the name Africa Proconsularis, as it was governed by a proconsul ) in the north and Africa Byzacena in the south, both of which were part of the Dioecesis Africae.

In 293, as part of Diocletian's reforms, the province of Epiros became known as Epirus Vetus ( including Adrianopolis, Phoiniki, Ogchismos, and Bouthroton as the most northerly major cities, and Akarnania and the islands of Kerkyra, Ithaca, and probably Leukas to the south ).

With Diocletian's reforms, it was split from Moesia as a separate province of " Scythia ", being part of the Diocese of Thrace.

Rather, they now characterize it as a much more subtle, gradual transformation, in which Diocletian's reforms of the Imperial office, while significant, are but one point on a sliding scale.

They are first mentioned in 319, but may date to Diocletian's reforms in the late 3rd century.

The legion moved to Aila ( close to modern Aqaba ), probably during Diocletian's reforms, and is recorded as still camping there at the time of the compilation of the Notitia Dignitatum, in the 390s, when it is reported serving under the Dux Palaestinae.

Emperor Constantine completed Diocletian's reforms and organized the Roman Empire into four pretorian prefectures late in his reign, actually the former territorial circumscriptions of the former four imperial tetrarchs to which each praetorian prefect had acted as chief of staff: the Prefecture of the Gauls, the Prefecture of Italy and Africa, the Prefecture of Illyricum, and the Prefecture of Oriens, with each administrated by an imperially appointed Praetorian prefect.

The dissemination of imperial law to the provinces was facilitated under Diocletian's reign, because Diocletian's reform of the Empire's provincial structure meant that there were now a greater number of governors ( praesides ) ruling over smaller regions and smaller populations.

After Diocletian's reform of the provinces, governors were called iudex, or judge.

In spite of Diocletian's attempts at reform, the provincial restructuring was far from clear, especially when citizens appealed the decisions of their governors.

The extension of the line from the main entrance to the apse shows towards Jerusalem, but as an orthodromic distance curve shows towards the obelisk of the Karnak Temple, from where are the sphinxes in the Diocletian's Palace in Split.

When the proposed government of universal Christendom by five patriarchal sees ( Rome, Constantinople, Alexandria, Antioch and Jerusalem, known as the pentarchy ), under the auspices of a single universal empire, was formulated in the legislation of Emperor Justinian I ( 527-565 ), especially in his Novella 131, and received formal ecclesiastical sanction at the Council in Trullo ( 692 ), the name " patriarch " became the official one for the Bishops of these sees, and the title " Exarch " remained the proper style of the metropolitans who ruled over the three remaining ( political ) dioceses of Diocletian's division of the Eastern Prefecture, namely the Exarchs of Asia ( at Ephesus ), of Cappadocia and Pontus ( at Caesarea ), and of Thrace ( at Heraclea Sintica ).

Diocletian's accession in 284 did not mark an immediate reversal of disregard to Christianity, but it did herald a gradual shift in official attitudes toward religious minorities.

It is possible that Flavius Constantius, the governor of Dalmatia and Diocletian's associate in the household guard, had already defected to Diocletian in the early spring.

Saint Sebastian ( died c. 288 ) was an early Christian saint and martyr, who is said to have been killed during the Roman emperor Diocletian's persecution of Christians.

Salona was an early Roman settlement, which became overshadowed when Emperor Diocletian constructed the nearby Diocletian's Palace in about the year 300 AD.

Saint Eulalia of Mérida was an early Christian martyr from Mérida, Spain, who was killed during Diocletian's repressions around 304.

* Maxima of Rome, early Christian saint and martyr killed in Emperor Diocletian's purges

Diocletian's reign stabilized the Empire and marks the end of the Crisis of the Third Century.

Diocletian's stay in the East saw diplomatic success in the conflict with Persia: in 287, Bahram II granted him precious gifts, declared open friendship with the Empire, and invited Diocletian to visit him.

The sharp increase in the number of edicts and rescripts produced under Diocletian's rule has been read as evidence of an ongoing effort to realign the whole Empire on terms dictated by the imperial center.

The Tetrarchy | Tetrarchs were the four co-rulers who governed the Roman Empire as long as Diocletian's reform lasted.

During the Roman Empire when Sisak was known as Siscia, Christian martyr Quirinus of Sescia was tortured and nearly killed during Diocletian's persecution of Christians.

They include his Fastes de l ' empire romain (" The Splendours of the Roman Empire "), and editions of Diocletian's Edict on Maximum Prices and of Philippe Lebas ' Voyage archéologique ( 1868 – 1877 ).

The Tetrarchy ultimately degenerated into civil war, but the eventual victor, Constantine the Great, restored Diocletian's system of dividing the Empire into East and West.

A Western Roman Empire existed intermittently in several periods between the 3rd and 5th centuries, after Diocletian's Tetrarchy and the reunifications associated with Constantine the Great and Julian the Apostate ( 324 – 363 ).

The argenteus was a silver coin produced by the Roman Empire from the time of Diocletian's coinage reform in AD 294 to ca.

* Both the notion of " partnership " in the form of a senior emperor and several junior co-emperors ( usually, but not necessarily, his sons ), and Diocletian's titulature, but mainly versed in Greek ( e. g. Sebastos for Augustus, a literal translation ), became quite common is the Eastern Roman Empire, i. e. Byzantium, which lasted a further millennium after the fall of the Western Empire.

Following Diocletian's abdication in 305, civil war erupted among the various co-emperors, during which time each of the contenders appointed his own prefect, a pattern carried on during the period where the Empire was shared between Licinius and Constantine I.

Diocletian's elevation of Bassus as consul symbolized his rejection of Carinus ' government in Rome, his refusal to accept second-tier status to any other emperor, and his willingness to continue the long-standing collaboration between the Empire's senatorial and military aristocracies.

Diocletian's reduction of the Praetorian Guards to the level of a simple city garrison for Rome lessened the military powers of the prefect, but the office retained much civil authority.

He seems not to have served in any important military or administrative position during Diocletian's and his father's reign, though.

In the 6th Century, when Justinian increasingly reversed Diocletian's strict separation of civil and military authority, praeses granted military authority over their province were generally elevated to the related, older term Praetor.

Alternatively, a more idiomatic style may develop into an equally prestigious tradition of titles, because of the shining example of the original – thus various styles of Emperors trace back to the Roman Imperator ( strictly speaking a republican military honorific ), the family surname Caesar ( turned into an imperial title since Diocletian's Tetrarchy ).