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# Battle of Adrianople
## Overview
The Battle of Adrianople (9 August 378 CE) was a catastrophic Roman defeat in which a Gothic coalition destroyed a Roman army and killed Emperor Valens. @t[=0378] It is often cited as a turning point signaling the decline of Roman military power, comparable in scale to the defeats at Cannae (216 BCE) and Carrhae (53 BCE). [^3]
## Key Facts
- Date: 9 August 378 CE @t[=0378] <!-- reviewed:2026-02-23 -->
- Location: Adrianople (modern Edirne, Turkey), Roman province of Thracia @t[=378] <!-- reviewed:2026-02-23 -->
- Belligerents: Eastern Roman Empire vs. Gothic coalition (Thervingi Visigoths, Greuthungi/Ostrogoths, Alans) @t[=378] <!-- reviewed:2026-02-23 -->
- Commanders: Emperor Valens (Rome, killed), Fritigern (Thervingi, d. c. 380 CE) @t[=378] <!-- reviewed:2026-02-23 -->
- Result: Decisive Gothic victory @t[=378] [^1] <!-- reviewed:2026-02-23 -->
- Roman losses: Approximately two-thirds of the army (~10,00020,000 killed), including Valens @t[=378] [^1][^2] <!-- reviewed:2026-02-23 -->
## Background
The battle was the culmination of the Gothic War (376382 CE). @t[0376..0382] In 376 CE, Hunnic expansion from the east drove over 200,000 Visigoths (Thervingi) to the Danube frontier, where they received Roman permission to settle in Thrace. @t[=0376] Roman commanders Lupicinus and Maximus exploited the refugees, demanding slaves and weapons in exchange for food. Facing starvation, the Goths revolted under Fritigern. Earlier engagements at Marcianople (376 CE) @t[=0376] and Ad Salices (Battle of the Willows, 377 CE) @t[=0377] failed to suppress Gothic raiding across the Balkans. [^3]
By 378 CE, Valens — who had been campaigning against Persia — returned to Constantinople under pressure from its citizens and marched against Fritigern. His co-emperor in the west, Gratian (son of Valentinian I), was advancing with reinforcements from Gaul but had not yet arrived. [^1]
## The Battle
- Valens attacked without waiting for Gratian's western reinforcements, reportedly driven by jealousy of his nephew's military successes @t[=378] [^1][^3] <!-- reviewed:2026-02-23 -->
- Fritigern sent peace envoys on the morning of battle — historians regard this as a stalling tactic to await the return of ~10,000 Greuthungi cavalry who were away foraging @t[=378] [^1][^3] <!-- reviewed:2026-02-23 -->
- Roman cavalry on the left flank was routed when the Greuthungi arrived and struck unexpectedly @t[=378] <!-- reviewed:2026-02-23 -->
- Roman infantry, already exhausted from an eight-mile march in August heat without food or water, was surrounded and annihilated @t[=378] [^1] <!-- reviewed:2026-02-23 -->
- Valens was mortally wounded; his body was never recovered @t[=378] [^1] <!-- reviewed:2026-02-23 -->
## Significance
- Demonstrated the vulnerability of Roman legions to heavy cavalry and the dangers of poor scouting and low morale @t[378..] [^2][^3] <!-- reviewed:2026-02-23 -->
- The Goths lacked siege equipment and could not take Adrianople itself; the Gothic War continued until 382 CE @t[378..382] [^3] <!-- reviewed:2026-02-23 -->
- Led to the Treaty of 382 CE: Emperor Theodosius I settled the Goths within the empire as *foederati*, granting land in exchange for military service @t[=0382] [^2][^4] <!-- reviewed:2026-02-23 -->
- Alaric, a Visigoth and former Roman commander, sacked Rome in 410 CE — a downstream consequence of the foederati settlement @t[=0410] [^3] <!-- reviewed:2026-02-23 -->
- Often considered a harbinger of the fall of the Western Roman Empire (476 CE) @t[378..] [^2][^4] <!-- reviewed:2026-02-23 -->
---
[^1]: Ammianus Marcellinus, *Res Gestae* 31.1213 (~390 CE)
[^2]: Burns, T.S. *Barbarians Within the Gates of Rome*. Indiana University Press, 1994.
[^3]: Wasson, Donald L. "Battle of Adrianople." *World History Encyclopedia*, 2014. https://www.worldhistory.org/Battle_of_Adrianople/
[^4]: Heather, Peter. *The Fall of the Roman Empire: A New History of Rome and the Barbarians*. Oxford University Press, 2006.## Review Queue
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- [ ] `@q[missing]` Line 9: "Location: Adrianople (modern Edirne, Turkey), Roman province of Thracia" - what is the source?
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- [ ] `@q[missing]` Line 10: "Belligerents: Eastern Roman Empire vs. Gothic coalition (Thervingi Visigoths,..." - what is the source?
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- [ ] `@q[missing]` Line 11: "Commanders: Emperor Valens (Rome, killed), Fritigern (Thervingi, d. c. 380 CE)" - what is the source?
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- [ ] `@q[missing]` Line 23: "Roman cavalry on the left flank was routed when the Greuthungi arrived and st..." - what is the source?
> The cavalry routing claim does not appear to have an explicit footnote in the visible document content. A source citation should be added — Ammianus Marcellinus (Res Gestae, Book 31) is the primary source for this detail.