- November 24 - Theodosius I makes his adventus, or formal entry, into Constantinople.
- Publication of a new translation of the Scriptures by St. Jerome, known as the Vulgate.
- Roman Emperor Theodosius I declares Christianity to be the official religion of the Roman Empire.
- Roman Emperors Theodosius I and Gratianus declare that the patriarchs of Rome and Alexandria hold primacy (above especially the one of Constantinople), implicitly rejecting Arianism in favor of orthodox christianity.
- St. Gregory of Nazianzus orders burning of all known copies of Sappho's poetry.
- Bedouin Queen Mavia's Saracen troops defeat a Roman army.
- Tyconius writes commentary on the Bible's book of Revelation.
- First signs of Human presence on Easter Island (http://www.gci.ch/GreenCrossFamily/board/bios/heyerdahl.html).
- Cathedral built in Trier, Germany.
- Council of Saragossa.
- Rock of Cashel built in Ireland.
- Auxentius Durostorensis becomes bishop Durostor.
- Temple of Ephesus put out of business (so to speak) by Christianity becoming official (and only) religion of the Roman Empire.
- Athanaric becomes king of the Visigoths upon Fritigern's death
- St. Peter Chrysologus, at Imola in Emilia.
- Hephaistio of Thebes, Egyptian astrologer.
- St. Alexios, in Rome.