310s

Roman Empire

• July 11 – Maximian, retired co-emperor, rebels against Constantine the Great while campaigning against the Franks. He attempts to make himself emperor at Arles. Constantine marches his army along the Rhine and embarks his troops at Chalon-sur-Saône. Maximian flees to Marseille and is captured. Constantine encourages his suicide and Maximian, age 60, hangs himself.
• Maximinus II and Constantine I are declared filii Augustorum ("Sons of the Augusti"). For the first time four emperors administer the Roman Empire.
• Constantine constructs near the town of Colonia Claudia Ara Agrippinensium (Cologne) a stone bridge over the Rhine, which is guarded by the castellum Divitia (modern Deutz).
• Constantine begins to build the Basilica of Constantine in Augusta Treverorum (Trier).
• A large Pictish raid southwards is attempted.

Commerce

• Constantine at Trier orders the minting of a new coin, the solidus, in an effort to offset the declining value of the denarius and bring stability to the imperial currency by restoring a gold standard. The solidus (later known as the bezant) will be minted in the Byzantine Empire without change in weight or purity until the 10th century.

Religion

• April 18 – Pope Eusebius succeeds Pope Marcellus I as the 31st pope, but is banished on August 17 by the Emperor Maxentius to Sicily, where he dies, perhaps from a hunger strike.

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