Afterwards, during 299 and 302, as Diocletian was then residing in the East, it was Galerius ' turn to campaign victoriously on the Danube.

Diocletian moved into Egypt to suppress him, first putting down rebels in the Thebaid in the autumn of 297, then moving on to besiege Alexandria.

According to tradition, San Marino was founded in 301 AD when a Christian stonemason named Marinus the Dalmatian, later venerated as Saint Marinus, emigrated in 257 AD from the Dalmatian island of Rab, then a Roman colony, when the emperor Diocletian issued a decree calling for the reconstruction of the city walls of Rimini which had been destroyed by Liburnian pirates.

Dionysius copied the last decennovenal cycle of the Cyrillian table ending with Diocletian 247, and then added a new 95-year table with numbered Anni Domini Nostri Jesu Christi ( Years of our Lord Jesus Christ ) because, as he explained to Petronius, he did not wish to continue the memory of a tyrant who persecuted Christians.

He minted his own coins and brought their value into line with Roman issues as well as acknowledging and honouring Maximian and then Diocletian.

Sebastian then stood on a step and harangued Diocletian as he passed by ; the emperor had him beaten to death and his body thrown into a privy.

It was organized into Moesia, later Moesia Superior, and in the administrative reforms of Diocletian ( 244 – 311 ) it was part of the Diocese of Moesia, then the Diocese of Dacia.

During the third century, the denarius was replaced by the double denarius, now usually known as the antoninianus or radiate, which was then itself replaced during the monetary reform of Diocletian which created denominations such as the argenteus ( silver ) and the follis ( silvered bronze ).

It later became part of Germania Superior and then part of the Diocletian province of Maxima Sequanorum.

Diocletian returned to the East.

The following spring, as Maximian prepared a fleet for an expedition against Carausius, Diocletian returned from the East to meet Maximian.

It is unclear if Diocletian was present to assist the campaign ; he might have returned to Egypt or Syria.

At the conclusion of the peace, Diocletian and Galerius returned to Syrian Antioch.

Diocletian returned to Antioch in the autumn of 302.

* 308 – At Carnuntum, Emperor emeritus Diocletian confers with Galerius, Augustus of the East, and Maximianus, the recently returned former Augustus of the West, in an attempt to restore order to the Roman Empire.

In this phase, crystallised by the reforms of the emperor Diocletian ( ruled 284 – 305 ), the Roman army returned to regular annual conscription of citizens, while admitting large numbers of non-citizen barbarian volunteers.

The Baths were commissioned by Maximian in honor of co-Emperor Diocletian in 298 AD, the same year he returned from Africa.

Dorotheus is said to have been driven into exile during the persecution of Diocletian, but later returned.

He supported the Church financially, had an extraordinary number of basilicas built, granted privileges ( e. g. exemption from certain taxes ) to clergy, promoted Christians to high-ranking offices, returned property confiscated during the Great Persecution of Diocletian, and endowed the church with land and other wealth.

In the spring of 293, in either Philippopolis ( Plovdiv, Bulgaria ) or Sirmium, Diocletian would do the same for Galerius, husband to Diocletian's daughter Valeria, and perhaps Diocletian's praetorian prefect.

Diocletian spent the spring of 293 traveling with Galerius from Sirmium ( Sremska Mitrovica, Serbia ) to Byzantium ( Istanbul, Turkey ).

In 296, Diocletian reorganized Pannonia into four provinces: Pannonia Prima, Pannonia Valeria, Pannonia Savia and Pannonia Secunda, and Sirmium became the capital of Pannonia Secunda.

Historian David Potter describes the transformation of government under Diocletian when describing the shifts in imagery the Emperor used to display his power ( in this case the building of a huge new palace at Sirmium ):

He was a man skilled in areas of government where Diocletian, presumably, had no experience.

Diocletian travelled south along the Nile the following summer, where he visited Oxyrhynchus and Elephantine.

They met at the same hill, out of Nicomedia, where Diocletian had been proclaimed emperor.

Diocletian saw his work as that of a restorer, a figure of authority whose duty it was to return the empire to peace, to recreate stability and justice where barbarian hordes had destroyed it.

The term Tetrarchy ( Greek: " leadership of four ") describes any form of government where power is divided among four individuals, but in modern usage usually refers to the system instituted by Roman Emperor Diocletian in 293, marking the end of the Crisis of the Third Century and the recovery of the Roman Empire.

Diocletian may or may not have been present at the battle, but would present himself soon afterwards at Antioch, where the official version of events was made clear: Galerius was to take all the blame for the affair.

Helena and her son were dispatched to the court of Diocletian at Nicomedia, where Constantine grew to be a member of the inner circle.

Theophanes ' chronicle of world events, covering events from the accession of Diocletian in 284 ( the point where the chronicle of George Syncellus ends ) to the downfall of Michael I Rhangabes in 813, is valuable for preserving the accounts of lost authorities on Byzantine history that would be otherwise lost for the seventh and eighth centuries.

In the early Byzantine period ( 4th to early 7th century ) the system of government followed the model established in late Roman times under Diocletian and Constantine the Great, with a strict separation between civil and military offices and a scale of titles corresponding to office, where membership or not in the Senate was the major distinguishing characteristic.

The decree now exists only in fragments found mainly in the eastern part of the empire, where Diocletian ruled.

Under the reign of Western Roman Emperor Maximian, co-emperor with Diocletian, Cyriacus was tortured and put to death, beheaded in 303 on the Via Salaria, where he was subsequently buried.

Early in the persecution of Diocletian the Emperor summoned Chrysogonus to Aquileia where he suffered martyrdom.

The titles were probably meant to convey certain characteristics of their associated leaders ; Diocletian, in Jovian style, would take on the dominating roles of planning and commanding ; Maximian, in Herculian mode, would act as Jupiter's heroic subordinate.

Galerius and Constantius would become Augusti after Diocletian and Maximian's departure.

Diocletian argued that forbidding Christians from the bureaucracy and military would be sufficient to appease the gods, but Galerius pushed for extermination.

Diocletian would soon follow.

Diocletian therefore issued his Edict on Coinage, an act re-tariffing all debts so that the nummi, the most common coin in circulation, would be worth half as much.

Constantine would claim to have the same close relationship with the Christian God as Diocletian claimed to have with Jupiter.

These continuing problems would be radically addressed by Diocletian, allowing the Empire to survive in the West for over a century, and in the East for over a millennium.

By the time of Diocletian, however, this two-stage process had largely disappeared, and the Praetor would either hear the whole case in person or appoint a delegate ( a iudex pedaneus ), taking steps for the enforcement of the decision ; the formula was replaced by an informal system of pleadings.

In 286, Diocletian elevated a military colleague, Maximian, to the throne as co-emperor of the western provinces, while Diocletian took over the eastern provinces, beginning the process that would eventually see the division of the Roman Empire into two halves, a Western and an Eastern portion.

Between 303 and 305, Galerius began maneuvering to ensure that he would be in a position to take power from Constantius after the passing of Diocletian.

He invented a new hoisting machine for raising the masonry needed for the dome, a task no doubt inspired by republication of Vitruvius ' De Architectura, which describes Roman machines used in the first century AD to build large structures such as the Pantheon and the Baths of Diocletian, structures still standing which he would have seen for himself.

He issued the first proper silver coins that had appeared in the Roman Empire for generations, knowing that good quality bullion coinage would enhance his legitimacy and make him look more successful than Diocletian and Maximian.

Theodora's father would have been consul in 292, and praetorian prefect under Diocletian.

* The reign of Emperor Diocletian ( 284-305 ), who attempted substantial political and economic reforms, many of which would remain in force in the following centuries.

This church was chosen for several reasons: ( 1 ) Like other baths in Rome, the building was already naturally southerly oriented, so as to receive unobstructed exposure to the sun ; ( 2 ) the height of the walls allowed for a long line to measure the sun's progress through the year more precisely ; ( 3 ) the ancient walls had long since stopped settling into the ground, ensuring that carefully calibrated observational instruments set in them would not move out of place ; and ( 4 ) because it was set in the former baths of Diocletian, it would symbolically represent a victory of the Christian calendar over the earlier pagan calendar.

By AD 300 the Baths of Diocletian would cover 1. 5 million square feet ( 140, 000 m² ), its soaring granite and porphyry sheltering 3, 000 bathers a day.

The last public taurobolium for which there is an inscription was carried out for Diocletian and Maximian at Mactar in Numidia at the close of the 3rd century ; the Christian emperors would hardly have encouraged such a rite in their honour.

Since he was said to have been martyred at the age of fourteen during the persecution under Diocletian, Pancras would have been born around 289, at a place designated as near Synnada, a city of Phrygia Salutaris, to parents of Roman citizenship.