In his Easter table the year 532 AD was equated with the regnal year 248 of Emperor Diocletian.

A further massive transfer of Bastarnae was carried out by emperor Diocletian ( ruled 284-305 ) after he and his colleague Galerius defeated a coalition of Bastarnae and Carpi in 299.

Dalmatia was the birthplace of the Roman Emperor Diocletian, who, upon retirement from Emperor in AD 305, built a large palace near Salona, out of which the city of Split later developed.

Diocletian (; c. 22 December 244 – 3 December 311 ), was a Roman Emperor from 284 to 305.

After the deaths of Carus and his son Numerian on campaign in Persia, Diocletian was proclaimed Emperor.

The title was also claimed by Carus ' other surviving son, Carinus, but Diocletian defeated him in the Battle of the Margus.

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

Diocletian was not the only challenger to Carinus ' rule: the usurper M. Aurelius Julianus, Carinus ' corrector Venetiae, took control of northern Italy and Pannonia after Diocletian's accession.

It was all good publicity for Diocletian, and it aided in his portrayal of Carinus as a cruel and oppressive tyrant.

As leader of the united East, Diocletian was clearly the greater threat.

It was too much for a single person to control, and Diocletian needed a lieutenant.

Diocletian was in a less comfortable position than most of his predecessors, as he had a daughter, Valeria, but no sons.

The relationship between Diocletian and Maximian was quickly couched in religious terms.

Diocletian refused and fought a battle with them, but was unable to secure a complete victory.

Bahram II's gifts were widely recognized as symbolic of a victory in the ongoing conflict with Persia ; Diocletian was hailed as the " founder of eternal peace ".

Maximian's appointment is unusual in that it was impossible for Diocletian to have been present to witness the event.

It has even been suggested that Maximian usurped the title, and was only later recognized by Diocletian in hopes of avoiding civil war.

On his return to the East, Diocletian managed what was probably another rapid campaign against the resurgent Sarmatians.

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

In a public ceremony at Antioch, the official version of events was clear: Galerius was responsible for the defeat ; Diocletian was not.

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

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.

Diocletian, by contrast, was prodigious in his affairs: there are around 1, 200 rescripts in his name still surviving, and these probably represent only a small portion of the total issue.

Eusebius references to the encampment of the Legio X Fretensis at Aila ( in southern Israel, near modern Aqaba and Eilat ); the X Fretensis was probably transferred from Jerusalem to Aila under Diocletian.

He was probably a Roman soldier martyred for the Christian faith during the persecution of Diocletian in 304 in the city of Porto Torres (), according to the legend on the orders of the governor ( preside ) of Sardinia and Corsica, a certain Barbarus.

Constantius remained in Britannia for a few months, replaced most of Allectus ’ officers, and the British provinces were probably at this time subdivided along the lines of Diocletian ’ s other administrative reforms of the Empire.

Maximian's swift appointment by Diocletian as Caesar is taken by the writer Stephen Williams and historian Timothy Barnes to mean that the two men were longterm allies, that their respective roles were pre-agreed and that Maximian had probably supported Diocletian during his campaign against Carinus ( r. 283 – 285 ) but there is no direct evidence for this.

According to Koch, the name Arawn may be derived from the Biblical name Aaron, the name of Moses ’ s brother, and so is ultimately of Hebrew origin and meaning ‘ exalted .’ That the name ‘ Aaron ’ had currency in Wales as early as Roman times is shown by Gildas who wrote that ‘ Aaron and Iulianus were Christian martyrs at Urbs Legionis ( the ‘ city of the legion ,’ probably Caerllion-ar-Wysg ) in the time of the Emperor Diocletian .’ a cleric of the Old Welsh name Araun witnessed two charters of 860 preserved in the book of Llandaf.

The Virgin Martyr, in which Dekker probably had a large share, is really a miracle play, dealing with the martyrdom of Dorothea in the time of Diocletian, and the supernatural element is freely used.

Numbers were restored to their early 2nd-century level of c. 400, 000 ( but probably not to their 211 peak ) under Diocletian ( r. 284 – 305 ).

With the benefit of archaeological discoveries of recent decades, many contemporary historians view the late army as no larger than its predecessor: under Diocletian c. 390, 000 ( the same as under Hadrian almost 2 centuries earlier ) and under Constantine no greater, and probably somewhat smaller, than the Principate peak of c. 440, 000.

Legends of Christian martyrs such as Felix and Regula in Zürich probably are based on events that occurred during the persecution of Christians under Diocletian around 298.

It was probably created as part of the administrative reforms of the Roman Emperor Diocletian after the defeat of the usurper Allectus by Constantius Chlorus in 296 AD.

Britannia Secunda was one of the provinces of Roman Britain in existence by c. 312 AD and probably created as part of the administrative reforms of the Roman Emperor Diocletian after the defeat of the usurper Allectus by Constantius Chlorus in 296 AD.

In the late third or early 4th century ( probably during the reign of Diocletian ) the Roman army constructed an army camp measuring 100 x 100 m. on the northern side of the plateau.

Dux Britanniarum was a military post in Roman Britain, probably created by Diocletian or Constantine I during the late third or early fourth century.

His resentment fed his discontent with official policies of tolerance ; from 302 on, he probably urged Diocletian to enact a general law against the Christians.

As they left office, Diocletian and Maximian probably imagined Christianity to be in its last throes.

Marinus was born in Rome, and prior to becoming pope he was attached to the Church of Saint Cyriacus in the Baths of Diocletian.

In the sixth century the city was renamed Georgiopolis after St. George, a soldier in the guard of the emperor Diocletian, who was born there between 256 and 285 AD.

Near the city emperor Diocletian, born in Salona, built the Diocletian's Palace ( around year 300 AD ), which is the largest and most important monument of late antique architecture in the World.

He was born at Huesca and martyred under the Emperor Diocletian around the year 304.

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.