(3rd century - 4th century - 5th century - other centuries)

As a means of recording the passage of time, the 4th century was that century which lasted from 301 to 400.

Events

• Definitive declaration of biblical canon: Council of Carthage
• Demotic is replaced by Greek
• Constantine I ends persecution of Christians in the Roman Empire. Christianity is made the official religion of the Empire. The Roman Empire's seat of government is moved to Constantinople.
• Aksum is converted to Christianity by St. Frumentius of Tyre.
• Trade between Europe and Western Sahara.
• Destruction of the Roman Army at the Battle of Adrianople in 378

Significant persons

• Saint Ambrose, bishop of Milan
• Ammianus Marcellinus, Roman Historian
• Emperor Constantine I
• Saint Martin of Tours
• Saint Augustine of Hippo, theologian

Inventions, discoveries, introductions

Decades and years