325

By place

Roman Empire

• Emperor Constantine I personally assures the security of the Danube frontier by defeating the Goths, the Vandals, and the Sarmatians.
• Licinius is executed in Thessalonica, on charge of conspiring and raising troops against Constantine I.
• Gladiatorial combat is outlawed in the Roman Empire.
• The First Council of Nicaea is held.

  China

• April 1 - Crown Prince Jin Chengdi, age 4, succeeds his father Jin Mingdi as emperor of the Eastern Jin dynasty. During his reign he is largely advised by regents, his uncle Yu Liang and high-level officials.

  By topic

Art

• Constantine the Great, from the Basilica of Maxentius and Constantine, Rome, is started to be made. It is now kept at Palazzo dei Conservatori, Rome.

  Religion

• May 20 - First Council of Nicaea: Constantine I summons an ecumenical council of bishops in Nicaea. The Nicene Creed, adopted on June 19, declares that the members of the Trinity are equal. The council decides that Easter is celebrated on the first Sunday after the first full moon after the vernal equinox. Arius is exiled to Illyria; his works are confiscated and consigned to the flames.
• The Church of the Nativity is built in Bethlehem.