According to Lactantius, Diocletian and Galerius entered into an argument over imperial policy towards Christians while wintering at Nicomedia in 302.

According to Lactantius, Diocletian and Galerius entered into an argument over what imperial policy towards Christians should be while at Nicomedia in 302.

Palace of the Roman Emperor Diocletian, around which the Croatian city of Split ( city ) | Split emerged.

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.

There is a contemporary issue of coins suggestive of an imperial adventus ( arrival ) for the city, but some modern historians state that Diocletian avoided the city, and that he did so on principle, as the city and its Senate were no longer politically relevant to the affairs of the Empire and needed to be taught as much.

At the conclusion of discussions with the Persians, Diocletian re-organized the Mesopotamian frontier and fortified the city of Circesium ( Buseire, Syria ) on the Euphrates.

Diocletian believed that Romanus of Caesarea was arrogant, and he left the city for Nicomedia in the winter, accompanied by Galerius.

Diocletian soon grew impatient with the city, as the Romans acted towards him with what Edward Gibbon, following Lactantius, calls " licentious familiarity ".

In addition to his administrative and legal impact on history, the Emperor Diocletian is considered to be the founder of the city of Split in modern-day Croatia.

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.

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.

* Diocletian re-organized the Mesopotamian frontier and fortifies the city of Circesium ( modern Busayrah ) on the Euphrates.

Under the reorganization of the empire by Diocletian, Rouen became the chief city of the divided province of Gallia Lugdunensis II and reached the apogee of its Roman development, with an amphitheatre and thermae of which the foundations remain.

The Romans based much of their architecture on the dome, such as Hadrian's Pantheon in the city of Rome, the Baths of Diocletian and the Baths of Caracalla.

Christian tradition makes him a native of the Dalmatian city of Salona, today Solin near Split, the son of a man also named Caius, and a member of a noble family related to the Emperor Diocletian.

An imperial palace was constructed here, in which the emperors after the time of Diocletian frequently resided ; and the city often played a part in the struggles between the rulers of the 4th century.

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.

" Constructed between 1497 and 1514, the Cathedral houses the remains of Saints Justus and Pastor, two Christian schoolboys martyred near the city during the persecutions of the Roman Emperor Diocletian at the beginning of the fourth century.

The Emperor Diocletian ( r. 284-305 ) was the last of the great builders of Rome's city infrastructure and he did not omit the Forum from his program.

Nicomedia was the metropolis of Bithynia under the Roman Empire, and Diocletian made it the eastern capital city of the Roman Empire in 286 when he introduced the Tetrarchy system.

This coat of arms originates from the Roman Emperor Diocletian who made his palace ( the core of city of Split ) the capital of the Western Roman Empire.

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.

Nicomedia was the eastern and most senior capital city of the Roman Empire between 286 and 324, during the Tetrarchy introduced by Diocletian.

Alexander ’ s reign contained some of the last major building works constructed in Rome before the reign of Diocletian.

If Diocletian ever did enter Rome shortly after his accession, he did not stay long ; he is attested back in the Balkans by 2 November 285, on campaign against the Sarmatians.

Diocletian replaced the prefect of Rome with his consular colleague Bassus.

In the East, Diocletian engaged in diplomacy with desert tribes in the regions between Rome and Persia.

On 20 December 303, Diocletian cut short his stay in Rome and left for the north.

There are suggestions in the Panegyrici Latini and Lactantius ' account that Diocletian arranged plans for his and Maximian's future retirement of power in Rome.

Diocletian invaded and vast amounts of territory from western provinces of Greater Armenia became " protectorates " of Rome.

* 304 – Roman Emperor Diocletian orders the beheading of the 14-year-old Pancras of Rome.

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

After the abdication of Diocletian in 305, and the accession in Rome of Maxentius to the throne of the Caesars in October of the following year, the Christians of the capital again enjoyed comparative peace.

Rome, Baths of Diocletian

The two emperor system originally established by Diocletian in the previous century fell into regular practice, and the east continued to grow in importance as a centre of trade and imperial power, while Rome itself diminished greatly in importance due to its location far from potential trouble spots, like Central Europe and the East.

* November 28 – Diocletian makes a visit to Rome.

* A Triumphal Arch is built for Diocletian in Rome.

* The Baths of Diocletian are dedicated, the thermae become the largest imperial baths in Rome.

Examples include the aqueducts of Rome, the Baths of Diocletian and the Baths of Caracalla, the basilicas and Colosseum.

The entry for Saint Caius is as follows: " At Rome, in the cemetery of Callistus on the Via Appia, the burial of Saint Caius, Pope, who, fleeing from the persecution of Diocletian, died as a confessor of the faith.

Carinus at once left Rome and set out for the East to meet Diocletian.

He was taken from there to Rome to drive out a demon which had taken possession of a son of the Emperor Diocletian.

During Narses ' time, Rome was ruled by Diocletian and it was with Diocletian and his son-in-law Galerius that Narses

When the Emperor Diocletian threatened to make war on her father, her father went with his family to Rome to ask for peace.

Located on the Campana Road, these catacombs are said to have been the resting place, perhaps temporarily, of Simplicius, Faustinus and Beatrix, Christian Martyrs who died in Rome during the Diocletian persecution ( 302 or 303 ).