315

By place

Roman Empire

• Constantine the Great and co-emperor Licinius battle the Sarmates, the Goths and the Carpians along the Danube. Constantine leads a punitive expedition into Dacia and reestablishes the Roman fortifications of the frontier.
• July 25 - The Arch of Constantine is completed near the Colosseum at Rome to commemorate Constantine's victory over Maxentius at the Milvian Bridge. As part of the ceremony Constantine is expected to make a sacrifice to Rome's traditional gods, but he refuses to do so.
• Constantine I dedicates the Basilica of Maxentius and installs a large statue of himself inside it.
• Crucifixion is abolished as punishment in the Roman Empire.
• A program of assistance to the poor is established in the Roman Empire.
• Immense baths are constructed in Augusta Treverorum.

  By topic

Religion

• Eusebius becomes bishop of Caesarea.
• The lamb becomes the symbol of Jesus in Christian art.