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.

Diocletian was probably born near Salona in Dalmatia ( Solin in modern Croatia ), some time around 244.

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 table counted the years starting from the presumed birth of Christ, rather than the accession of the emperor Diocletian on 20 November 284, or as stated by Dionysius: " sed magis elegimus ab incarnatione Domini nostri Jesu Christi annorum tempora praenotare ..." It is assumed Dionysius Exiguus intended either 1 AD or 1 BC to be the year of Christ's birth ( a " year zero " does not exist in this calendar ).

Ar., lxiv, and De Syn., xviii ), St Athanasius does not recall from memory being a first hand witness to the onset of the great persecution by the Tetrarchy of Diocletian and Maximian in February 303, for in referring to the events of this period he makes no direct appeal to his own personal recollections, but falls back on tradition.

Such numbers may have amounted to a substantial proportion, if not all, of the Peucini Bastarnae: Victor claims that the Carpi resettled in Pannonia by Diocletian at the same time, together with those previously transferred by Aurelian, amounted to the entire Carpi tribe.

Galerius, aided by Diocletian, campaigned successfully against Sassanid Persia, the Empire's traditional enemy.

Weakened by illness, Diocletian left the imperial office on 1 May 305, and became the only Roman emperor to voluntarily abdicate the position.

Diocletian dated his reign from his elevation by the army, not the date of his ratification by the Senate, following the practice established by Carus, who had declared the Senate's ratification a useless formality.

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.

They were joined by blood and marriage ; Diocletian and Maximian now styled themselves as brothers.

Domitianus died in December 297, by which time Diocletian had secured control of the Egyptian countryside.

Diocletian found much to be offended by in Manichean religion: its novelty, its alien origins, the way it corrupted the morals of the Roman race, and its inherent opposition to long-standing religious traditions.

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

Rhetorically Eusebius records the Oracle as saying " The just on Earth ..." These impious, Diocletian was informed by members of the court, could only refer to the Christians of the Empire.

Diocletian regulated his court by distinguishing separate departments ( scrina ) for different tasks.

These dukes sometimes administered two or three of the new provinces created by Diocletian, and had forces ranging from two thousand to more than twenty thousand men.

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.

The Codex Gregorianus includes rescripts up to 292, which the Codex Hermogenianus updated with a comprehensive collection of rescripts issued by Diocletian in 293 and 294.

The fifth-century pagan Zosimus, by contrast, praised Diocletian for keeping troops on the borders, rather than keeping them in the cities, as Constantine was held to have done.

Under the Christian Constantine, Diocletian was maligned.

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

* 303 – Roman Emperor Diocletian orders the destruction of the Christian church in Nicomedia, beginning eight years of Diocletianic Persecution.

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.

Saint George ( c. 275 / 281 – 23 April 303 ) was, according to tradition, a Roman soldier from Syria Palaestina and a soldier in the Guard of Diocletian, who is venerated as a Christian martyr.

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.

* Emperor Diocletian goes with the young Constantine I the Great ( later the first Christian Roman Emperor ) on his staff to Egypt.

Under late Roman rule, Diocletian persecuted many Egyptian converts to the new Christian faith.

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.

Caesar Galerius led the pagan movement against Christianity and arrived to bring up Diocletian against Christianity in the year 302: first Christian soldiers had to leave the army, later the Church's property was confiscated and Christian books were destroyed.

Christianity reached Britain by the third century of the Christian era, the first recorded martyrs in Britain being St. Alban and Aaron and Julius, citizens of Carlisle, during the reign of Diocletian.

Eusebius's Life of Constantine claims that Constantius was himself a Christian, although he pretended to be a pagan, and while Caesar under Diocletian, took no part in the Emperor's persecutions.

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.

It had its roots in the social pressures among the long-established Christian community of Roman North Africa ( present-day Tunisia and Algeria ), during the persecutions of Christians under Diocletian.

The primary disagreement between Donatists and the rest of the early Christian Church was over the treatment of those who renounced their faith during the persecution under the Roman emperor Diocletian ( 303 – 5 ), a disagreement that had implications both for the Church's understanding of the Sacrament of Penance and of the other sacraments in general.

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 ).

According to Lactantius, " That /> Galerius might urge /> Diocletian to excess of cruelty in persecution, he employed private emissaries to set the palace on fire ; and some part of it having been burnt, the blame was laid on the Christians as public enemies ; and the very appellation of Christian grew odious on account of that fire.

According to Sebastian's 5th-century Acta Sanctorum, still attributed to Ambrose by the 17th-century hagiographer Jean Bolland, and the briefer account in Legenda Aurea, he was a man of Gallia Narbonensis who was taught in Milan and appointed as a captain of the Praetorian Guard under Diocletian and Maximian, who were unaware that he was a Christian.

Hagiography tells us that Lucy was a Christian martyr during the Diocletian persecution.

The Christian Church ( before the split into Roman Catholic and Eastern Orthodox ) adopted elements of temporal administration as introduced by the reforms of Diocletian and part of its terminology, as convenient for internal use:

The biographies have Demetrius as a young man of senatorial family who was run through with spears in around 306 AD in Thessaloniki, during the Christian persecutions of the emperor Diocletian or Galerius, which matches his depiction in the 7th century mosaics.