Events relating to the roman empire

Cyprian, bishop of Carthage, is one of many Christians martyred for refusing to sacrifice to the Roman gods

The emperor Aurelian, grateful for the apparent assistance of a Syrian sun god, establishes the cult of the Unconquered Sun - whose birthday is December 25

Diocletian, commanding an army near the Bosphorus in Thracia, is proclaimed emperor by his troops

The Jews of the Diaspora have by now spread through much of the Roman empire, where they are treated with tolerance

Constantine's father, recently appoinnted Augustus in the west, dies at York and the young man is proclaimed Augustus in his place by the legions in Britain

Constantine, preparing for battle against a rival at the Milvian Bridge, orders his men to wear a Christian symbol, the Chi-Rho, on their shields

Constantine meets his co-emperor Licinius in Milan, and persuades him to follow a policy of encouraging the Christians

Warming to his new Christian role, Constantine summons more than 300 bishops to Arles to discuss the controversial issue of Donatus

Roman mosaic is at its most lavish in the floors of Piazza Armerina, in central Sicily

Constantine executes Licinius in Thessalonica on a charge of attempted rebellion, a year after defeating him in battle

Constantine convenes a council of 200 bishops at Nicaea to discuss the beliefs of Arius, which are deemed to be heresy

An apocryphal story states that Julian the Apostate, dying at Tarsus, acknowledges the victory of the Galilean, Jesus Christ

The Vandals cross the Rhine into Gaul and move into Spain, from which the Visigoths soon push them on into Africa

The Roman city of Nîmes is sacked by the Vandals, in an early indication of the gradual loss of Gaul to the Germanic tribes

Alaric and the Visigoths enter Rome and plunder the city - the first foreign intruders for eight centuries

The Burgundians cross the Rhine and settle round Worms, before moving south to the Savoy region

Prompted by the fall of Rome to the Visigoths, St Augustine undertakes a great work of Christian philosophy, the City of God

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