Year by year · 4th century

378 CE

378 CE in world history: 6 events and 3 deaths. 134 recorded states existed that year.

Events

  1. 9 August

    Goths destroy a Roman army and kill Emperor Valens at Adrianople

    Gothic cavalry and infantry overwhelmed the Eastern Roman army near Adrianople in Thrace, killing Emperor Valens and much of his force. Rome was never again able to expel the Goths from its territory.

    Roman EmpireValens

  2. Battle

    Battle of Adrianople

    The Battle of Adrianople was fought in 378 CE in Thrace between the Roman army under the eastern emperor Valens and Gothic forces.

  3. Battle

    Battle of Argentovaria

    The Battle of Argentovaria was fought in 378 in Alsace between the Western Roman army of the emperor Gratian and the Alemannic Lentienses, who had crossed the frozen Rhine.

ProfileState93 states with a known seat in 378 CEOpen the atlas at 378 CE →

In the profiles

  • Roman EmpireGothic forces kill Emperor Valens and much of the Eastern field army at Adrianople
  • TeotihuacanSiyaj K’ak’ arrives at Tikal, and a new king linked to Teotihuacan takes power
  • AlemanniGratian’s army defeats the Lentienses at Argentaria in Alsace

Died in 378 CE 3

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APA
The Epoch Institute. (2026). 378 CE. In The Epoch Institute, Year by Year. https://the-epoch-institute.org/years/378
MLA
“378 CE.” The Epoch Institute, Year by Year, The Epoch Institute, 2026, https://the-epoch-institute.org/years/378. Accessed .
Chicago
The Epoch Institute. “378 CE.” The Epoch Institute, Year by Year. 2026. https://the-epoch-institute.org/years/378.
Harvard
The Epoch Institute (2026) ‘378 CE’, The Epoch Institute, Year by Year. Available at: https://the-epoch-institute.org/years/378 (Accessed: ).