321

By topic

Roman Empire

• Emperor Constantine I expels the Goths from the Danube frontier and repairs Trajan's Bridge. He leads an expedition into the old province Dacia and makes peace with the barbarians.
• March 7 - Constantine I signs legislation directing urban residents to refrain from work, and businesses to be closed, on the "venerable day of the Sun". An exception is made for agriculture.

  Asia

• Tuoba Heru launches a coup d'état against his cousin Tuoba Yulü, and becomes the new Prince of Dai.

  By topic

Arts and sciences

• Calcidius translates Plato into Latin.

  Food and drink

• Constantine I assigns convicts to grind Rome's flour, in a move to hold back the rising price of food in an empire whose population has shrunk as a result of plague.

  Religion

• The Christian Church is allowed to hold property.
• A synod held in Alexandria condemns Arianism.